Final report 2014-2018

  1. Develop and investigate multifunctional nanocomposites including polymer hybrid nanocomposites
  2. Develop nanocomposite materials for high performance thermoelectric generators for recuperation of the wasted heat (in co-operation with the 2nd Project)
  3. Develop methods for diagnostics of materials micro-, nano-scale features and quality improvement
  4. Develop and investigate multifunctional materials and composites including polymer hybrid nanocomposites, biomaterials and composite materials (int. al. composite materials from fibre based products) for sustainable long-term application under the influence of the factors of external environment

No

Activity of the project

Description

Results

1

1.1.

Development of biodegradable thermoplastic polymer matrix nanocomposites and characterization of structure and exploitation properties of the respective nanocomposites and/or hybrid nanocomposites

Manufacturing technology for development of biodegradable polymer (thermoplastic starch TPS) nanocomposites with layered silicates (montmorillonite clay MMT) has been developed.

Basic technological paramaters (including compounding temperature, mixing element rotation speeds, friction, cycle time) of manufacturing of TPS/MMT nanocomposites hve been determined.

A method has been approbated to considerably improve dispersion of nanoclay within polymer matrix.

Suitability of ionic liquids (ILs) and maleic anhydride grafted polyethylene compatibilizer (PEgMA) for modification of TPS nanocomposites has been evaluated.

Manufacturing technology (compression moulding) of TPS nanocomposites has been developed. The effects of distinct technological parameters (pre-heating temperature and time, compression moulding time, pressure and time, cooling time), as well as of introduction of modifiers (IL, PE-g-MA) on the surface quality of the TPS nanocomposite test specimens, as well as it structure, mechanical, thermal and moisture sorption/desorption characteristics at various ambient relative moisture contents have been evaluated.

The results of the research play an important role in the area of the development of innovative multiphase systems with increased biobased content, that have opened new co-operation possibilities (int. al., positively evaluated joint co-operation project).

2

1.2.

Development of recyclable thermoplastic polymer matrix nanocomposites and characterization of structure and exploitation properties of the respective nanocomposite and/or hybrid nanocomposite

Extensive investigations on the development, processing and characterization of structure and exploitation properties of recyclable thermoplastic polymer matrix (thermoplastics with various chemical structure, molecular mass, crystallinity degree such as polyethylene (PE), ethylene-octene copolymers with diverse 1-octene (EOC) content (in the range between 17-38 %, polyoxymethylene (POM), acrylonitrile-butadiene-styrene copolymer (ABS)) based nanocomposites with nanostructured fillers of various anisodiamtery (plate-like MMT, fibrous carbon nanotubes (CNTs), irregular (ZnO)) have been carried out to obtain perspective functional composite materials with broad property spectrum for wide range of different applications.

The efficiency of the manufacturing technology has been evaluated by analysing structure as well as properties of the aforementioned polymer nanocomposites

3

1.3.

Evaluation of the effects the aggressive factors of external environment (ionising irradiation, UV or Xe lamp irradiation, moisture, temperature) on the structure and exploitation characteristics of polymer nanocomposites and hybrid nanocomposites

Methods have been developed for evaluation of exploitation properties of polymer composites in relation to the influence the aggressive factors of external environment, particularly ionising radiation, viewed also as a method of modification of polymer nanocomposites with CNTs.

The effect of ionising radiation on the structure and properties (such as structural, mechanical, thermoshinkable, dielectric and others) of cross-linkable polymer (either EOC or PE) nanocomposites with CNTs has been evaluated in a rather broad range of absorbed doses (75 kGy – 2 MGy).

On the one hand it was determined that CNTs act as a shield in respects to the detrimental influences of ionising irradiation as it was confirmed by appropriate structural investigations (decrement of oxidation as well as carbonyl indices, for an example).

On the other hand, at purposefully selected absorbed dose levels, the effect of ionising irradiation for modification of CNTs containing PE and EOC nanocomposites has been evaluated.

It has been observed that up to the absorbed irradiation doses of 150 and 300 kGy gel fraction of the EOC/CNT compositions increase allowing to assume incorporation of CNTs within the spatially cross-linked network of the polymer matrix.

Increment of quasistatic and dynamic moduli as well as strength of the investigated nanocomposites have been also observed along with increasing the absorbed irradiation dose. It is worth mentioning that certain radiation modified EOC and PE (and even PP) compositions and it nanocomposites maintain acceptable ultimate deformation values, playing an important role in ensuring the needed orientation capacity at the development of thermoshrinkable materials.

It has been determined that in the presence of CNTs, thermorelaxation stresses of certain EOC based compositions are higher than those of neat radiation modified EOC.

4

1.4.

1.5.

Development of nanofiller (int. al. carbon nanotubes, cellulose nanocrystals, graphene, layered silicates) containing polymer nanocomposites and hybrid nanocomposites. Description of manufacturing methods and characterization of short-term and long-term (creep) properties of the developed polymer nanocomposites and hybrid nanocomposites

Layered silicate nanofiller containing polymer composites have been obtained and their short- and long-term elastic properties have been determined in order to validate the prediction approach of the elastic behaviour of the respective polymer nanocomposites.

Creep behaviour of several polymer nanocomposites (including PE nanocomposites with CNTs and polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS) nanocomposites with MMT) has been explored and possible prediction approaches have been evaluated. Besides it investigations have been also performed on the characterization of microcreep behaviour of EOC nanocomposites with neat and modified CNTs.

It has been determined that in the presence of the nanofiller creep resistance of the polymer nanocomposites is considerably increased. It has been, however, demonstrated that in the presence of the nanofiller creep rate is increased to certain extent.

By considering that experimental results of elastic properties of certain polymer nanocompsites are lower than theoretically predicted, importance of modification of interfacial interaction has been justified and approaches for its increment have been considered.

5

1.6.

Development of manufacturing technology, as well as characterization of structure and properties of the developed naocomposites

Manufacturing methodology, as well as characterization of structure and properties of the elaborated polymer nanocomposites (PNC) with piezopermittivity effect have been made.

An original elastomer / carbon nanocomposite sample manufacturing method has been elaborated by the vulcanization of samples in autoclave at neutral gas atmosphere, at both variable and constant temperatures. Piezopermittivity effect in the samples consisting of elastomer / carbon nanoparticle composites has been detected. The mechanical and electrical properties of elaborated samples under action of compressive and tensile forces have been investigated.

If a sample is created only from one and the only PNC layer, then a matrix versus filler amount ratio yields a useful piezopermittivity effect as the filler concentration reaches an amount, which is slightly above the electrical percolation threshold and partially in the percolation transition area.

Direct proportionality between the concentration of carbon nanoparticles in the polymer matrix and decrease rate of dielectric constant (in both - tensile and compressive strain cases) has been observed.

A prototype of an active element for mechanical vibration energy harvester made of elastomer/elastomer composite possessing piezopermittivity effect has been elaborated. The prototype of the active element has made of three layers of polymer material and two brass electrodes. The layers have been bonded to each other using glue or through vulcanisation process in the following order: 1. polymer insulator (polyisoprene); 2. Carbon nanoparticle-polyisoprene composite and 3. polyisoprene. Outer polymer layers in the three-layer structure are necessary to stop the DC electrical conductivity and also to increase the possible PNC layer deformation degree while a sample is mechanically loaded.

For the investigation of the energy transformation processes in mechanically loaded capacitors with nanostructured polymer composite the procedure of controlled charge and discharge of capacitors with capacitance higher than 1 nF has been elaborated.

Piezocapacitance (consequently, also piezopermittive) effect for the natural rubber based composite samples with different types of conductive fillers (including CNTs, RGO) and different filler concentrations have been studied in a frequency range from 20 Hz to 2 MHz. In addition to piezopermittivity effect, AC piezoconductance effect has been studied.

It can be concluded that the largest piezopermittive effect, however, possesses NR/GNCB (natural rubber/graphitized nanostrucutred carbon black) sample containing 4 phr GNCB (ΔC = 12% for Δp = 183 kPa, f = 200 Hz). It can be noted, that the NR/RGO sample has a higher electrical resistance (two-three orders of magnitude), which yields a lower leakage current.

Ethylene-octene copolymer (EOC) carbon black (CB: 10-30 m.p.) composites, that show self-regulating heating effect, if they are electrically heated, were developed. By applying a constant voltage to the samples, they reach and maintain an equilibrium temperature that differs for samples with different mass parts of CB.

The electrical resistance change due to temperature changes has been measured. It has been found that for temperatures below 273K the electrical resistance slowly decreases with increasing the temperature (negative temperature coefficient of resistivity), but for temperatures above 273K the resistivity increases steeply with the increase of temperature (positive temperature coefficient of resistivity).

Larger samples (85 x 75 x 0.7 mm) of ethylene-octene copolymer and carbon black composite for measurements with an applied voltage and current have been also made. The temperature distribution throughout the sample for heating cycles has been recorded using a thermos-photo-camera.

The electrical resistance dependence on the applied voltage and the resulting equilibrium temperature to which the sample heats has been measured. This equilibrium temperature can be adjusted by changing the applied voltage and the filler load in the composite.

6

1.7.

Development of polymer nanocomposites with oriented 1D (carbon nanotubes) and 2D (graphene) carbon nanostructures. Characterization of structure and properties of the developed nanocomposites

Manufacturing methodology, as well as characterization of structure and properties of the elaborated polymer nanocomposites with oriented 1D (carbon nanotubes) and 2D (graphene) carbon nanostructures have been made.

Electrically conductive nano-particles from thermally expanded graphite (TEG) were obtained. Electrical resistance of the synthesized nanoparticles was an order of magnitude lower then by the same reduction method obtained reduced graphene oxide from a commercially available graphene oxide.

An original method is proposed for 1D carbon nanoparticles orientation in silicone oil by using electrostatic field and periodic treatment of suspension with ultrasonic homogenizer. Obtained composites showed long lasting nanoparticle orientation after electrostatic field was removed.

Studies of photo-thermal resistance change effect were conducted for nanographite (NG) (graphitized carbon nanoparticles) powder layer and for samples of plate-type polyisoprene/nanographite composite (PNC). Interesting results were obtained: under the influence of laser radiation, electrical resistance of the NG layer decreased (negative photo-thermal resistance effect), but in case of PNC samples which were made from the same NG powder, positive photo-thermal resistance effect was observed (hereto, noticeably larger) – electrical resistance under the influence of the laser radiation increased. Based on thesis of quantum physics, theoretical models for both effects were developed.

Impact of various external electrostatic field intensities ranging from 50 to 250 V/cm on 0 D (conductive carbon black), 1 D (multi wall carbon nanotubes) and 2 D (graphene nanoplatelets) nanographite filler orientation in silicone oil suspensions was evaluated by electrical resistivity and optical microscopy experiments. Various viscosities (100, 500 and 1000 mPa·s) of silicone oil suspensions were used and impact on conductive grid formation due to external electrostatic field was determined. Each suspension composition were made with 5 different nanographite concentrations (0,0125; 0,025; 0,05; 0,1; 0,2 wt(%)) and electrostatic field impact on electrical conductivity percolation was analysed depending on filler type and oil viscosity. It was observed that the viscosity of the silicone oil made the highest impact on electroconductive grid formation due to external electrical field.

Based on these results, from poly(vinyl acetate) ethanol mixture, orientated nanographite filler composites were made and high anisotropy of electrical resistance was observed – resistivity of samples in parallel and perpendicular direction to orientation of electric field differed more than 5 times.

Polymer/reduced graphene oxide composites were acquired using previously developed solution based method, where the chemically reduced nanoparticles were dispersed in the polymer matrix via a chloroform solution and in the next step the mixture was cold roll mixed and afterwards vulcanized into cylindrical samples with brass electrodes. A new effect of the composite material was observed – the electrical conductivity of the sample decreased with increasing the voltage above 150 V. A distinct piezoresistive effect was observed when the measurement was done at a heightened voltage of 500V. The piezoresistive effect parameters were investigated. The samples showed significantly high relative electrical resistance change (~175%), which was almost 2 times higher, then the best result for these kinds of samples using different nanofillers for this matrix.

Nanoparticle orientation effectivity was described using anisotropy coefficient where electrical conductivity in parallel and in perpendicular direction to orientation were compared. For an example for polyvinylacetate/multiwalled CNTs composite, using DC, the anisotropy coefficient was very low – about one. However, using AC it was relatively higher – about six.

A method for determination of permittivity of carbon nanoparticle/ polymer composites during the particle alignment process was also developed.

Composite samples, containing oriented nanoparticles within ethylene-vinyl acetate copolymer (EVA) were also obtained.

Obtained sample anisotropy coefficient was not high (about 3), but obtained samples were tested as VOC vapour sensors and sensing results showed sensing effect anisotropy.

Optical microscopy images of the structures, formed by carbon particles during alignment process of carbon nanoparticle/polymer composites, were obtained. It was found that under influence of electric field carbon nanoparticle aggregates formed a network-like structure that was oriented parallel to the direction of the electric field.

7

1.8.

Development of polymer nanocomposites for sensing of various biochemical compounds in biotechnology. Characterization of structure and properties of the developed nanocomposites

The method for selective distinction of vapours of various volatile substances by using the developed polymer (polyisoprene or ethylene-vinyl acetate copolymer (EVA))/carbon nanoparticle (carbon black (CB) or reduced thermally exfoliated graphite oxide) composites was developed. Principal component analysis was conducted in order to analyse the sensing effect selectivity.

The sensor samples, depending on its composition, were tested in polar, semi-polar and non-polar gaseous organic vapours media (ethanol, chloroform and toluene respectively), BTEX (benzene, toluene, ethylbenzene and xylene).

The highest chemoresistivity effect of polyisoprene matrix/ reduced thermally exfoliated graphite oxide composite was observed in non-polar – toluene – vapours.

Basing on gas chromatography and sensing effect results it can be concluded that EVA-CB can detect basic fuel composition changes via fuel vapours.

The influence of the preparation of EVA-CB composites on it sensing effect was also researched. It was found that using spin coating (especially at 1000 rpm rotation speed) in composite preparation provided higher sensing effect than dip coating.

Research on oriented nanoparticle composites preparation were performed. Obtained EVA-CB sample anisotropy coefficient was not high (about 3), but obtained samples were tested as VOC vapour sensors and sensing results showed sensing effect anisotropy.

EVA-CB samples, which were prepared (oriented), using alternating current (AC), were tested in toluene vapours. Results showed that the highest relative electrical resistance change was with samples, where sensing effect was measured in parallel direction to nanoparticle orientation.

8

3.1.

Optimized technologies for manufacturing, processing and recycling of biodegradable and recyclable polymer nanocomposites and hybrid nanocomposites.

To improve dispersion of nanofiller within polymer matrix as well as to increase interfacial interaction within the system, manufacturing and processing/recycling technologies of polymer based nanocomposites have been improved.

Particular attention has been devoted to optimization of manufacturing technology of thermoplastic polyolefine matrices (i.e., EOC and PE) based composites with different CNTs (differing with purity and aspect ratio) either unmodified or modified.

In general, it has been justified that the use of customized masterbatch technology allows considerably improve dispersion of CNTs within the chosen polymer matrix.

One of the most perspective technological approaches for manufacturing of polymer/CNT nanocomposites includes dissolving of polymer matrix in a suitable solvent and mixing it with the dispersion of CNTs in a solvent mixture, containing suitable processing aid, followed by obtaining of the masterbatch by precipitating it from the batch solution. The obtained masterbach further can be thermoplastically processed to obtain desired polymer nanocomposites.

The technology has been validated by obtaining various ABS, EOC and PE based nanocomposites with CNTs.

Various technological approaches have been developed for thermoplastic processing of the developed polymer nanocomposites, which have been validated by obtaining distinct demonstration test specimens by means of compression moulding (int. al polyolefine homo- and co-polymer as well as POM, ABS, PC based systems) and injection moulding (POM, ABS and PC based systems).

The efficiency of optimized manufacturing and processing/ recycling procedures has been evaluated in respects to improvement of structure and exploitation properties (such as elastic, electric/dielectric, thermal a.o.) of the developed polymer nanocomposites.

9

3.2.

Methods for complex characterization of structure and boundary processes of the developed polymer nanocomposites and hybrid nanocomposites

Broad investigation cycle on the modification of CNTs, for increasing compatibility with thermoplastic polymer matrices, as well as for improving exploitation properties, because of improved interfacial adhesion and synergy between CNTs, modifier and polymer matrix, has been carried out.

In general, CNTs have been modified with

1) laboratory synthesized imidazolium and pyridinium ionic liquids (side branch length C4… C12; anions: Br-, PF6-)

2) laboratory synthesized 2,2’-bithiophene, 3-octylthiophene and EDOT functional groups,

3) maleic anhydride grafted polyolefin compatibilizer.

The synthesized compounds have been characterized by using appropriate methods of structure analysis: FTIR, Raman, XRF, XRD and TGA. Simultaneously the method for determination electrical conductivity of the nanofiller has been developed.

The effect of introduction of modified CNTs on the structure and exploitation properties (including quasistatic and dynamic mechanical, thermal, heat transfer, calorimetric, electrical/dielectric) of the thermoplastic matrix based nanocomposites has been evaluated by using the appropriate investigation methods.

10

3.3.

Methods for complex characterization of 4 different material surface parameters in micro- and nanolevels.

A method for quantitatively characterizing electro conductive particle dispersion in a polymer matrix by using electro conductive mode of atomic force microscopy (EC-AFM) has been developed. Measuring the sample with EC-AFM we get an electro conductive channel image, that shows the electro conducting channels which go through the sample – from the surface where the AFM tip moves to the bottom electrode. These data are further mathematically processed – the overall channel distribution throughout the measured area and the channel size distribution are evaluated. Channel distribution is described by dIndex, which is calculated by dividing the EC-AFM image into 9 squares and calculating the percentage of area occupied by channels in each of the squares. The channel size distribution is described by sIndex, which is calculated by taking into account the smallest and the largest area occupied by a channel and the overall count of channels in the whole measured area.

An Excel macros programme has been made, which helps to calculate large data quantities. The input data are EC-AFM images processed with a free AFM software – Gwyddion.

11

3.4.

Mathematical modelling of the properties of the developed polymer nanocomposites and hybrid nanocomposites

Models characterizing the developed polymer nanocomposites and hybrid nanocomposites

Version of the model for prediction of elastic modulus of polymer-silicate is developed, allowing considerably concretize prediction of the modulus of elasticity for polymer-silicate nanocomposites with incompletely exfoliated filler particles.

A method for calculation the elastic constants of a three-phase composite, including polymer matrix, fully exfoliated layered nanoparticles and non-exfoliated particles in the form of multilayer intercalated stacks is also considered. Exfoliation degree has been introduced to characterize the extent of exfoliated filler particles. Validation of the developed approach for prediction of elastic constants if performed and it is concluded that the proposed model perfectly approximates the change of the modulus of elasticity of polymer composite reinforced with nanostructured layered silicates by considering concentration of the nanofiller as well as its distribution pattern within the polymer matrix.

12

3.5.

Recommendation for practical use of the developed polymer nanocomposites and hybrid nanocomposites

Recommendations for practical use of the developed polymer nanocomposites and hybrid nanocomposites have been given. The potential uses cover broad application areas in building, packaging, electronics and energetics sectors, including but not limited to products like biodegradable packaging, semi-biodegradable filtration materials, thermoshrinkable materials with form memory effect, specific smart materials with thermoelectric behaviour and energy harvesting capacities etc.

13

4.1.

Development of manufacturing and processing technologies of thermoplastic polymer nanocomposites, based on secondary polymer matrices

By using hemp shives (HS), secondary polypropylene fibers (PP) and secondary polyethylene terephtalate staple fibers (RPET) a range of environmentally friendly compositions have been developed for land drainage applications.

Investigations have been carried out on the development of non-wovens from hybrid fiber by using appropriate fiber pre-treatment and carding methods/technologies.

Development possibilities of multilayer hybrid composites by using appropriate thermal processing technology have been evaluated. Corresponding key technological parameters, such as temperature, pressure and cycle time, have been determined.

Most significant characteristics of HS/RPET/PP composites, such as mass per unit area, tensile strength and relative deformation, air permeability, water permeability, have been determined in relation to the manufacturing technology used. Up to 80% biodegradable content has been ensured by maintaining appropriate mechanical properties.

14

4.2.

Characterization of structure and exploitation features of thermoplastic polymer nanocomposites, based on secondary polymer matrices

By evaluating recycling possibilities of thermoplastic polymer matrix nanocomposites, it has been determined that for these purposes processing technologies (such as extrusion, pressing, injection moulding, 3D printing) of thermoplastic matrices (both ABS and polyolefine based) and it nanocomposites are suitable.

The effect of multiple processing on the properties of recyclable thermoplastic polymer matrices has been evaluated.

Detailed analysis has been carried out about the change of thermodynamic parameters of the selected polymer composites along with subsequent heating/cooling processes.

15

4.3.

Evaluation of the effects the aggressive factors of external environment (UV or Xe lamp irradiation, moisture, temperature) on the structure and exploitation characteristics of nanocomposites and/or hybrid nanocomposites, based on secondary polymers

Approaches for evaluation of exploitation properties of polymer composites in relation to the influence of the aggressive factors of the external environment (including UV irradiation, elevated temperature and moisture) have been evaluated.

Evaluation of stress-strain characteristics at both room and elevated temperatures have been carried out along with characterization of other exploitation properties (including thermogravimetric, calorimetric, electric/dielectric)

It has been determined that due to the addition of CNTs, resistance of the polyolefine elastomer (EOC) matrix based nanocomposites towards the influence of UV irradiation improves, as it was justified by FTIR data.

It has been also demonstrated, that although the modulus of elasticity and strength of CNTs containing thermoplastic nanocomposites, based on EOC, at elevated temperatures are lower than at room temperature (25oC), modifying effect of CNTs is still maintained, for an example, at temperature of 50oC 2,2 and 1,4 fold increments of the modulus and strength are still observed.

16

All the activities

Publicity of the results

Project results have been disseminated via 9 publications in the scientific journals with SNIP>1 (including 2 submitted publications), 20 publications in the scientific journals with SNIP<1 (including 1 submitted publication), proceedings of numerous international conferences (80 reports in total) as well as public events such as Researchers Nights 2016 and 2017.

17

All the activities up to the moment of the event

Organization of the International scientific conference by participation of the project executioners and national and foreign co-operation partners

In the framework of the international scientific conference Baltic Polymer Symposium 2015, held in Sigulda, September 16-18th, 2015, several plenary, oral and poster presentations on the achievements within the IMIS2 programme have been given by the leaders and executioners of the projects of the current National Research Program. In total 150 participants participated in the conference, 4 plenary, 30 oral and more than 100 poster presentations have been presented, allowing successful knowledge transfer of the achievements of IMIS2 to the global research community.

By considering successful dissemination of the results of IMIS2 in the framework of the Baltic Polymer Symposium 2015, presentation of the most recent achievements of the results of the projects within IMIS2 is planned in the forthcoming international scientific conference Baltic Polymer Symposium 2018, organized by us in Jurmala from 12th to 14th of September.

PUBLISHED SCIENTIFIC PAPERS:

In journals with SNIP > 1

R1.Maris Knite; Kaspars Ozols; Armin Fuith; Ilze Aulika; Raimonds Orlovs , Photo-Thermal Electrical Resistance Response of Polyisoprene/Nanographite Composites, Polymer 85, 2016, 55-60, doi:10.1016/j.polymer.2016.01.031 (SCOPUS; SNIP= 1.252) 1,163

R2. M.Knite, A.Linarts, K.Ozols, V.Tupureina, I.Stalte, L.Lapcinskis, A study of electric field induced conductive aligned network formation in high structure carbon black/silicone oil fluids, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 526 (2017) 8-13. (SCOPUS; SNIP= 1.104) 1,016

R3. Santa Stepina, Astrida Berzina, Gita Sakale, Maris Knite, BTEX detection with ethylene vinyl acetate nanostructured carbon composite, Beilstein Journal of Nanotechnology, 2017, 8, 982–988. doi:10.3762/bjnano.8.100, SNIP = 1.233

R4. L.Lapcinskis, A.Linarts, M.Knite, I.Gornevs, J.Blums, A.Sutka, Solid-state supercapacitor application in pressure sensing, Appl. Surf. Sci., 2018 (Article in press) (SCOPUS; SNIP= 1.225)1,328

R5. R. D. Maksimov, E. Plume, and J. Jansons. The effect of partial exfoliation of multilayer silicate filler particles on the elastic properties of a polymer composite // Composite Structures, 2018, Volume 183 Pages 483-488 SNIP = 1,939/2,033.

R6. Reinholds, I., Kalkis, V., Merijs-Meri, R., Zicans, J., & Grigalovica, A. (2016). Heat shrinkable behavior, physico-mechanical and structure properties of electron beam cross-linked blends of high-density polyethylene with acrylonitrile-butadiene rubber. Radiation Physics and Chemistry, 120, 56-62, SNIP=1,020

R7. Zicāns J., Merijs Meri R., Kalniņš M., Maksimovs R., Jansons J. Modeling and experimental investigations of elastic and creep properties of thermoplastic polymer nanocomposites ZAMM Zeitschrift fur Angewandte Mathematik und Mechanik, Volume 95, Issue 10, pages 1098-1110, October 2015, SNIP=1,085

In journals with SNIP < 1

R8. Plyushch, A.O., Paddubskaya, A.G., Kuzhir, P.P., Maksimenko, S.A., Ivanova, T., Merijs-Meri, R., Bitenieks, J., Zicans, J., Suslyaev, V.I., Pletnev, M.A. Comparative Analysis of Electromagnetic Response of PVA/MWCNT and Styrene-Acrylic Copolymer/MWCNT Composites, Russian Physics Journal, 2016, 59(2), pp. 278-283, SNIP=0,706

R9. Merijs-Meri, R., Zicāns, J., Ābele, A., Ivanova, T., Kalniņš, M., Kundziņš, K. Modification of Polyoxymethylene for Increased Thermal Resistance. Polymer Engineering and Science, 2017, Vol. 57, Iss.7, 772.-778.lpp. e-ISSN 1548-2634. doi:10.1002/pen.24625, SNIP=0,835

R10. Astrida Berzina , Velta Tupureina, Igors Klemenoks, Maris Knite, A Method for Dispersion Degree Characterization Using Electro Conductive Mode of Atomic Force Microscopy, Procedia Computer Science, 104 (2017) 338–345 (SCOPUS; SNIP= 0.705)

R11. K.Ozols, M.Knite, Mechanical Pressure Induced Capacitance Changes of Polyisoprene/Nanostructured Carbon Black Composite Samples, IOP Conf. Series: Materials Science and Engineering, 2015, 77, p1-5, doi:10.1088/1757-899X/77/1/01/2024 (SCOPUS; SNIP= 0.499)

R12. Stiebra, L; Cabulis, U; Knite, M, Polyurethane foams obtained from residues of PET manufacturing and modified with carbon nanotubes, Journal of Physics: Conference Series, Volume 709, Number 1, April 2016, pp. 12002-12008(7) DOI: 10.1088/1742-6596/709/1/012002 (SCOPUS; SNIP= 0.383)

R13. Lesničenoks, P., Bērziņa, A., Lukoševičš, I., Grīnberga, L., Jēkabsons, L., Kleperis, J., Knite, M., Taurins, G. Complex Multilayer Carbon Structures for Green Energetics. Proceedings of the Estonian Academy of Sciences, 2017, Vol. 66, Iss.4, pp.403-408. (SCOPUS; SNIP= 0.450)

R14. G. Vugule, I. Reinholds, J. Zicans, R. Merijs-Meri, K. Ozols, Development and Characterization of Novel Conductive Nanofiller Based on Multi-Walled Carbon Nanotubes Grafted with Poly(3,4-Ethylenedioxythiophene), Key Engineering Materials, 2018, Vol.762, pp. 203-208, ISSN 1662-9795 (SCOPUS; SNIP=0.253)

R15. Reinholds, I., Kaļķis, V., Zicāns, J., Merijs-Meri, R., Bočkovs, I., Grigaloviča, A., Muizzemnieks, G. New Thermoshrinkable Materials of Radiation Modified Polypropylene-Elastomer Composites with Cross-linking Agents. Key Engineering Materials, 2014, Vol.604, 134.-137.lpp. ISSN 1662-9795. Pieejams: doi:10.4028/www.scientific.net/KEM.604.134

R16. Kaļķis, V., Reinholds, I., Zicāns, J., Merijs-Meri, R., Bitenieks, J., Bočkovs, I. Radiation-Chemically Modified PP/CNT Composites. e-Polymers, 2014, Vol.14, Iss.4, 259.-265.lpp. ISSN 2197-4586. e-ISSN 1618-7229. Pieejams: doi:10.1515/epoly-2013-0092

R17. Ivanova T., Merijs Meri R., Zicans J., Grigalovica A., Roja Zh., and Reinholds I. Impact of non-functionalized and ionic liquid modified carbon nanotubes on mechanical and thermal properties of ethylene-octene copolymer nanocomposites (2016) IOP Conference Series: Materials Science and Engineering, Volume, 111, Number 1, pp. 1-8.http://iopscience.iop.org/article/10.1088/1757-899X/111/1/012019

R18. R. Merijs Meri, J. Zicans, A. Abele, T. Ivanova, M. Kalnins. Characterization of thermal destruction behavior of hybrid composites based on polyoxymethylene, ethylene-octene copolymer impact modifier and ZnO nanofiller. AIP Conf. Proc. 1736, 020141, Naples, Italy, June 19–23, 2016, p.1.-4.; dx.doi.org/10.1063/1.4949716

R19. Roja, Ž., Reinholds, I., Zicāns, J., Merijs-Meri, R. Evaluation of Mechanical and Structure Properties of Electron Beam Cross-Linked Ethylene-Octene Copolymer Nanocomposites with Multi-Walled Carbon Nanotubes. Key Engineering Materials, Volume 721, 2017, 28.-32, Doi:10.4028/www.scientific.net/KEM.721.28.

R.20. A. Bernava, S. Reihmane, J. Bitenieks, M. Manins, The Nonwovens Properties Made from Hybrid Fibres, Key Engineering Materials, Volume 721, 2017, 53-57, DOI 10.4028/www.scientific.net/KEM.721.13.

R21. I. Bochkov, R. Merijs Meri, G. Vugule, K. Korsaka-Mille and J. Zicans. Rheological properties of multi-component composites based on polymer-polymer matrix and nano-structured zinc oxide, Key Engineering Materials, Volume 721, 2017, 43-47, DOI 10.4028/www.scientific.net/KEM.721.13.

R22. J. Bitenieks, R. Merijs Meri, J. Zicans, M. Kalnins. Characterization of Polyvinyl Acetate/Multi Walled Carbon Nanotube Nanocomposites. Key Engineering Materials, Volume 721, 2017, 13-17, DOI 10.4028/www.scientific.net/KEM.721.13

R23. T. Ivanova, I. Reinholds, R. Merijs Meri, J. Zicans. Carbon nanotubes modified with octylthiophene derivatives for improved performance of ethylene-octene copolymer composites; Proceedings of the Estonian Academy of Sciences, 2017, 66, 4, 437–443

R24. A. Bernava, S. Reihmane, J. Bitenieks, R. Merijs Meri. The Properties of Mesh Reinforced Nonwoven Composites. Solid State Phenomena, Vol. 267, pp. 63-67, 2017.

R25. R. Merijs Meri, J. Zicans, T. Ivanova, J. Bitenieks, I. Reinholds, A. Abele & Zh. Roja (2016) Elastic properties of UV irradiated polyethylene-octene copolymer composites with functionalized multi-walled carbon nanotubes, Integrated Ferroelectrics, 173:1, 147-152, DOI: 10.1080/10584587.2016.118705

R26. Reinholds, I., Roja, Z., Meri, R. M., & Zicans, J. (2017). Characterization of electron beam cross-linked ethylene-octene copolymer composites with carbon nanotubes. Proceedings of the Estonian Academy of Sciences, 66(4).

SUBMITTED SCIENTIFIC PAPERS:

Ri1. Zh. Roja, R. Merijs-Meri, J. Zicans I. Reinholds. Thermal, Mechanical and Dielectric Properties of Electron Irradiated Polyolefin Elastomer Filled with Multi-Walled Carbon Nanotubes. Radiation Physics and Chemistry (iesniegts), SNIP=1,020

Ri2. Zhenija Roja, Janis Zicans, Remo Merijs-Meri, Ingars Reinholds, Guna Vugule, Liga Avotina, Aleksandrs Petjukevics. Thermal, Mechanical and Dielectric Properties of Electron Irradiated Ethylene-Octene Composites Filled with Multi-Walled Carbon Nanotubes Radiation Physics and Chemistry (iesniegts), SNIP=1,020

Ri3. Zhenija Roja Janis Zicans, Remo Merijs Meri, Guna Vugule, Juris. Gabrusenoks, Ingars Reinholds, Gunta Kizane. Improvement of the mechanical and dielectric properties of ethylene-octene copolymer / multi-walled carbon nanotube composites by grafting filler particles with poly(2,2’-bitiophene) . Polymer Composites (iesniegts), SNIP=0,764

CONFERENCE ABSTRACTS:

K1. A. Berzina, V. Tupureina, R. Orlovs, D. Saharovs, J. Bitenieks, and M. Knite, “Effect Of Chemical Reduction On Pre-Exfoliated Graphene Oxide Structure And Electrical Properties,” Advanced Research Materials, 2015, 1117, pp 187-190 www.scientific.net/AMR.1117.187

K2. Peteris Lesnicenoks, Liga Grinberga, Laimonis Jekabsons, Andris Antuzevičš, Astrida Berzina, Maris Knite, Gatis Taurins, Šarūnas Varnagiris, Janis Kleperis, Nanostructured carbon materials for hydrogen energetics, Advanced Materials Letters, 2017, 8(4), 518 -523

K3. Peteris Lesnicenoks, Liga Grinberga, Laimonis Jekabsons, Andris Antuzevičs, Astrida Berzina, Maris Knite, Gatis Taurins, Šarūnas Varnagiris, Janis Kleperis, Nanostructured carbon materials for hydrogen energetics, Advanced Materials Proceedings, 2018, 3(3), 136-141

K4. Roja, Ž., Reinholds, I., Zicāns, J., & Meri, R. M. (2017). Mechanical and Heat Shrinkable Properties of Electron Beam Irradiated Polypropylene With Bisphenol A Dimethacrylate Crosslinker. Materials Science and Applied Chemistry, 34(1), 34-37.

K5. G.Sakale, M.Knite, I.Klemenoks, S.Stepina, S.Sergejeva. Application of chemiresistive polymer films in air quality control. COST Action TD1105 - New Sensing Technologies for Air-Pollution Control and Environmental Sustainability - Third Scientific Meeting, organized by GEBZE and Bahcesehir University, Istanbul, 3-5 December 2014.

K6. R. Merijs-Meri, J. Zicans, I. Reinholds, V. Kalkis, E. Dilbeka. Modification of thermoplastic starch - nanoclay composites by means of ionic liquid. Program and Abstracts of the 2nd International Conference on Bioinspired and Biobased Chemistry & Materials N.I.C.E. 2014, October 15- 17, 2014, Nice, France, p. 291.

K7. A. Trausa, R. Bērziņa, J. Bitenieks, V. Peipiņš, A. Rudušs, R. Merijs Meri, J. Zicāns, V. Kokars. Structure and selected exploitation properties of the modified graphite nanoadditives containing polyvinyl alcohol composites. Book of Abstracts of the 55th International Scientific Conference of Riga Technical University, October 14-17, 2014, Riga, Latvia, p. 62.

K8. K.Ozols, M.Knite, Effect of Roll Mill Mixing on AC Conductance of Polyisoprene/Nanostructured Carbon Composites, Abstracts of the Riga Technical University 55th International Scientific Conference, October 14-17, 2014, Riga, Latvia, p 52

K9. Reinholds, I., Kaļķis, V., Zicāns, J., Merijs-Meri, R., Bitenieks, J. Structure and Properties of Functionalized Carbon Nanotube/Polypropylene Composites. No: 12th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity and 9th International Conference Functional Materials and Nanotechnologies: Book of Abstracts, Latvija, Rīga, 29. Sep-2. Okt., 2014. Riga: Institute of Solid State Physics, University of Latvia, 2014, 304.-304.lpp.

K10. J. Zicāns, R. Merijs Meri, R. Bērziņa, J. Bitenieks, V. Kokars, V. Peipiņš, A. Rudušs. Dielectric and mechanical relaxation in the modified carbon nanofillers containing polyvinyl alcohol composites. Book of Abstracts of Joint 12th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity and 9th International Conference Functional Materials and Nanotechnologies, Sept. 29. - Oct. 2., Riga, Latvia, F-50.

K11. R. Merijs Meri, J. Zicans, T. Ivanova, A. Kokins, V. Kalkis, I. Reinholds. Structure, rheological and mechanical properties of melt compounded polypropylene nanocomposites. Book of Abstracts of Joint 12th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity and 9th International Conference Functional Materials and Nanotechnologies, Sept. 29. - Oct. 2., Riga, Latvia, F-51.

K12. K.Ozols, M.Knite, Mechanical Pressure Induced Capacitance Changes of Polyisoprene/Nanostructured Carbon Black Composite Samples. No: Joint 12th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity and 9th International Conference "Functional Materials and Nanotechnologies": Book of Abstracts, Latvija, Rīga, 29. September-2. Oktober, 2014. Riga: Institute of Solid State Physics, University of Latvia, 2014, p.339. ISBN 978-9984-45-875-5.

K13. Reinholds, I., Kaļķis, V., Kizane, G., Zicāns, J., Merijs-Meri, R. Thermomechanical Properties of Electron Beam Modified Elastomer/Polypropylene Composites: Insulation Materials for Nuclear Power Plant Facilities. No: 28th Symposium on Fusion Technology (SOFT 2014), Spānija, San Sebastian, 29. Sep-3. Okt., 2014. San Sebastian: 2014, 782.-782.lpp.

K14. A. Berzina, V. Tupureina, R. Orlovs, D. Saharovs, J. Bitenieks, and M. Knite, “Effect of chemical reduction on pre-exfoliated graphene oxide structure and electrical properties,” The 13th International Conference on Global Research and Education Inter-Academia 2014, Riga, Latvia, September 10-12, 2014, p.105-106 ISBN 978-9934-10-583-8.

K15. Roja Zh., Reinholds I., Zicans J., Merijs Meri R., Bockovs I. Properties of Hybrid Nanocomposites Made from Masterbatches of Polymer / Ionic Liquid Functionalized Multi-Wallled Carbon Nanotubes. Materials of the International Conference ENGINEERING MATERIALS & TRIBOLOGY BALTMATTRIB 2015, Tallinn, Estonia, November 5-6, 2015, p. 7

K16. R. Berzina, G. Vugule, K. Korsaka-Mille, J. Zicans, A. Grigalovica, J. Bitenieks, A. Ruduss, V. Kokars. Characterization of dielectric, mechanical and thermal properties of polyvinylalcohol nanocomposites with organically modified carbonaceous nanofillers Abstracts of Riga Technical University 56th International Scientific Conference. Section Material Science and Applied Cheminstry, Latvija, Rīga, 14.-16. oktobris, 2015. Rīga: RTU Izdevniecība, 2015, 39.lpp. ISBN 978-9934-10-733-7.

K17. Roja, Ž., Reinholds, I., Zicāns, J., Merijs-Meri, R., Ābele, A. Polyethylene Composites with Multi-Walled Carbon Nanotubes Irradiated with High Rates (1-2MGy) of High- Energy Electrons. Abstracts of Riga Technical University 56th International Scientific Conference. Section Material Science and Applied Cheminstry, Latvija, Rīga, 14.-16. oktobris, 2015. Rīga: RTU Izdevniecība, 2015, 37.lpp. ISBN 978-9934-10-733-7.

K18. J. Bitenieks, R. Merijs Meri, J. Zicans, I. Reinholds, A. Grigalovica, Zh. Roja. Elastic and dielectric properties of aged polyethylene based composites with functionalized multi-walled carbon nanotubes. Book of Abstracts of the International Conference Functional Materials and Nanotechnologies FM&NT 2015, Vilnius, Lithuania, October 5 - 8, 2015, p.96

K19. Zh. Roja, J. Zicans, R. Merijs Meri, A. Grigalovica, I. Reinholds. Electrical and Thermo-physical Properties of Hybrid Materials Made from Multi-Walled Carbon Nanotubes with Polymerized Thiophene Derivatives. Book of Abstracts of the International Conference Functional Materials and Nanotechnologies FM&NT 2015, Vilnius, Lithuania, October 5 - 8, 2015, 118

K20. J.Blums, K.Ozols, A.Linarts, M.Knite, Polymer/Nanostructured Carbon Composites for Energy Harvesting. Programme and Proceedings: International Conference Baltic Polymer Symposium 2015, September 16-18, Sigulda, Latvia, p.23.

K21. Santa Stepina, Gita Sakale, Maris Knite, Temperature influence on chemical sensor-effect of polymer nanostructured carbon composites, Programme and Proceedings: International Conference Baltic Polymer Symposium 2015, Sigulda, Latvia, September 16-18, p. 43

K22. Astrida Berzina, Velta Tupureina, Maris Knite, Polyisoprene – reduced thermally exfoliated graphene oxide composite for sensor application, Programme and Proceedings: International Conference Baltic Polymer Symposium 2015, Sigulda, Latvia, September 16-18, p.68

K23. T. Ivanova, R. Merijs Meri, J. Zicans, A. Grigalovica, Zh. Roja, I. Reinholds. Modification of carbon nanotubes with ionic liquids and characterization of mechanical and thermal properties of polyethylene based nanocomposites. Book of Abstracts of the International conference Baltic Polymer Symposium 2015, Sigulda, Latvia, September 16-18, 2015, p.107

K24. J. Zicans, R. Merijs Meri, T. Ivanova, R. Berzina, V. Kokars. Novel carbon nanostructures as modifiers of elastic and electrical properties of polyvinylalcohol composites. Book of Abstracts of ICCS18 - 18th International Conference on Composite Structures, Lisbon, Portugal, June 15-18, 2015, p. 35.

K25. R. Merijs Meri, J. Zicans, T. Ivanova, Zh. Roja, I. Reinholds, A.Grigalovica, R. Berzina, I. Bockovs. Modification of carbon nanofillers and characterization of respective polyolefin composites. Materials of the EuroNanoForum 2015, 10-12 June 2015, Riga, Latvia, euronanoforum2015.eu/poster-sessions/

K26. M. Knite, G. Sakale, K. Ozols, A. Linarts, S. Stepina, V. Tupureina. Inovative Polymer/Nanographite composites for sensor applications. EuroNanoForum workshop 2015, 10-12 June 2015, Riga, Latvia. euronanoforum2015.eu/wp-content/uploads/2015/05/ENF-15 _Abstract_Maris-Knite.pdf

K27. M.Knite, K.Ozols, A. Fuith, I. Aulika, R. Orlovs. Photo-Thermal Resistivity Response of Polyisoprene/Nanographite Composites. Fourth International Symposium Frontiers in Polymer Science (In association with the journal „Polymer”), 22-25 May 2015, Riva del Garda, Italy.

K28. J. Zicans, R. Merijs Meri, T. Ivanova, A. Kaulina, V. Gorbatyuk. Comparison of non-woven composite materials from recycled polyethylene terephthalate fibres and natural fibers. Book of Abstracts of the 2nd International Conference on Natural Fibers - From Nature to Market ICNF, April 27.-29., 2015, San Miguel, Azores, Portugal, p. 1-2. ISBN: 978-989-98468-4-5

K29. R. Merijs Meri, J. Zicans, T. Ivanova, Ž. Roja, I. Reinholds. Ionic liquids for modification of thermoplastic starch nanocomposites. Book of Abstracts of International Conference Book of Abstracts of the 2nd International Conference on Natural Fibers - From Nature to Market ICNF, April 27.-29., 2015, San Miguel, Azores, Portugal, p. 1-2. ISBN: 978-989-98468-4-5

K30. Ž. Roja, I. Reinholds, J. Zicāns, R. Merijs-Meri, Electron Beam Cross-Linking of Ethylene-Octene Copolymer Nanocomposites with Multi-Walled Carbon Nanotubes to Improve their Temperature Dependence of Mechanical and Thermosetting Properties. The 25th International Baltic conference of Engeneering Materials & Tribology Baltmattrib 2016: Abstract Book, Latvija, Riga, 3.-4. novembris, 2016. Riga: RTU Digital Print Center, 2016, 75, ISBN 978-9934-19-029-2.

K31. J. Bitenieks, R. Merijs Meri, J. Zicans, M. Kalnins. Characterization of Polyvinyl Acetate/Multi Walled Carbon Nanotube Nanocomposites. The 25th International Baltic conference of Engeneering Materials & Tribology Baltmattrib 2016: Abstract Book, Latvija, Riga, 3.-4. novembris, 2016. Riga: RTU Digital Print Center, 2016, 78, ISBN 978-9934-19-029-2.

K32. I. Bochkov, R. Merijs Meri, G. Vugule, K. Korsaka-Mille and J. Zicans. Rheological properties of multi-component composites based on polymer-polymer matrix and nano-structured zinc oxide, The 25th International Baltic conference of Engeneering Materials & Tribology Baltmattrib 2016: Abstract Book, Latvija, Riga, 3.-4. novembris, 2016. Riga: RTU Digital Print Center, 2016, 75, ISBN 978-9934-19-029-2.

K33. A. Bernava, S. Reihmane, J. Bitenieks, M. Manins, The Nonwovens Properties Made from Hybrid Fibres, The 25th International Baltic conference of Engeneering Materials & Tribology Baltmattrib 2016: Abstract Book, Latvija, Riga, 3.-4. novembris, 2016. Riga: RTU Digital Print Center, 2016, 71, ISBN 978-9934-19-029-2.

K34. R. Kovaldins, I. Reinholds, G. Ķizāne, J. Zicāns, J. Gabrusenoks, Radiācijķīmiski šķērssaistītu daudzslāņu oglekļa nanocaurulīšu - poliolefīnu nanokompozīciju struktūras izpēte un mehānisko īpašību novērtējums. Abstracts of the 32nd Scientific Conference, Latvija, Riga, 17.-19. februāris, 2016. Riga: 2016, 56.-56.lpp.

K35. I. Reinholds, Ž. Roja, J. Zicāns, R. Merijs-Meri, Application of electron beam irradiation to improve structure and physical properties of carbon nanotube elastomeric composites. The Riga Technical University 57th International Scientific Conference "Materials Science and Applied Chemistry" 2016: Abstract Book, Latvija, Riga, 21.-4. oktobris, 2016. P-39.

K36. J. Zicāns, M. Knite, Ž. Roja, E. Plūme, R. Merijs Meri, T. Ivanova, J. Bitenieks, A. Bernava, V. Tupureina, J. Blūms, G. Šakale, A. Linarts, A. Vrubeļskis, I. Klemenoks, K. Ozols, S. Stepiņa, A. Bērziņa, R. Orlovs, V. Teteris, I. Stalte, I. Reinholds, J. Jansons, R. Maksimovs. National Research Programme IMIS2 3rd Project Nanocomposite Materials, The Riga Technical University 57th International Scientific Conference "Materials Science and Applied Chemistry" 2016: Abstract Book, Latvija, Riga, 21.-4. oktobris, 2016.

K37. J. Bitenieks, R. Merijs Meri, J. Zicāns, M. Kalniņš. Mechanical Properties of Polyethylene/Multi-Walled Carbon Nanotube Nanocomposite The Riga Technical University 57th International Scientific Conference "Materials Science and Applied Chemistry" 2016: Abstract Book, Latvija, Riga, 21.-4. oktobris, 2016. P-19.

K38. A. Kokins, I. Bochkov, J. Zicans, R. erijs Meri, T. Ivanova, J. Grabis, T.Reznika. Secondary polyprolylene based nanocomposites for engineering applications, The Riga Technical University 57th International Scientific Conference "Materials Science and Applied Chemistry" 2016: Abstract Book, Latvija, Riga, 21.-4. oktobris, 2016. P-21.

K39. P. Lesnicenoks, L. Grinberga, J. Kleperis, L. Jekabsons, G. Taurins, M. Knite. Carbon materials for hydrogen storage and sensing The Riga Technical University 57th International Scientific Conference "Materials Science and Applied Chemistry" 2016: Abstract Book, Latvija, Riga, 21.-4. oktobris, 2016. P-1.

K40. J.Blums, K.Ozols, M.Knite, Polymer/nanostructured carbon composites with stress dependent dielectric permittivity for electrostatic energy harvesters Abstracts of EMRS Spring meeting 2016, May 2-6, 2016, Lille, France, X PII.19

K41. S. Stepina, G. Sakale, M. Knite, Benzene and its derivatives detection with ethylene vinyl acetate – nanostructured carbon composite, Abstracts of EMRS Spring meeting 2016, May 2-6, 2016, Lille, France, X.PI.42

K42. M. Knite, V. Tupureina, A. Linarts, K. Ozols, I. Stalte, The study of electric field induced conductive grid structuration in silicone oil/ carbon nanofluids, Abstracts of 6th International Colloids Conference, 19–22 June 2016, Germany, Berlin, p 195

K43. J. Blums, K. Ozols, M. Knite, Application of Polymer/Nanostructured Carbon Composites for Electrostatic Energy Harvesters, University of Latvia, Institute of Solid State Physics, Abstracts of the 32nd Scientific Conference, Latvia, Riga, February 17-19, 2016, p 111.

K44. M. Knite, V. Tupureina, I. Stalte, K. Ozols, A. Linarts, R. Orlovs, Influence of Electrostatic Field on Carbon Nanoparticle Suspension Conductivity, University of Latvia, Institute of Solid State Physics, Abstracts of the 32nd Scientific Conference, Latvia, Riga, February 17-19, 2016, p 133.

K45. R. Merijs Meri, J. Zicans, T. Ivanova, R. Saldabola, I. Reinholds, M. Feldmann, H.P. Heim, Modification of carbon nanofillers, development and characterization of thermoplastic polyolefine elastomer nanocomposites. Abstracts of the 3rd International Conference on Bioinspired and Biobased Chemistry & Materials, October 16.-19., 2016, Nice, France, 223.

K46. J. Bitenieks, J. Zicans, R. Merijs Meri, T. Ivanova, M. Kalnins, P. Kuzhir, S. Maksimenko. Manufacturing of multi-walled carbon nanotubes containing polymer nanocomposites via latex based approach and their structural, electrical and mechanical characteristics Abstracts of the 3rd International Conference on Bioinspired and Biobased Chemistry & Materials, October 16.-19., 2016, Nice, France, 320.

K47. J. Bitenieks, R. Merijs Meri, J. Zicans, M. Kalnins. Mechanical and electrical characteristics of polyethylene/carbon nanotube nanocomposite. Book of Abstracts of the 16th International Conference Baltic Bolymer Symposium 2016, Klaipeda, Lithuania, September 21-24, 2016, p. 32.

K48. G. Vugule, A. Kokins, I. Bochkov, T. Ivanova, R. Merijs Meri, J. Zicans. Recycled polypropylene for development of polymer nanocomposites with ZnO. Book of Abstracts of the 16th International Conference Baltic Bolymer Symposium 2016, Klaipeda, Lithuania, September 21-24, 2016, p. 104.

K49. K. Korsaka-Mille, R. Merijs Meri, J. Zicans, T. Ivanova, I. Reinholds, Zh. Roja. Mechanical and Thermosetting Properties of Electron Beam Cross-Linked Ethylene-Octene Copolymer Nanocomposites with Multi-Walled Carbon Nanotubes. Book of Abstracts of the 16th International Conference Baltic Bolymer Symposium 2016, Klaipeda, Lithuania, September 21-24, 2016, p. 103.

K50. J. Zicans, R. Merijs Meri, T. Ivanova, A. Abele, M. Kalnins, J. Grabis, Maksimovs. Structural, mechanical and thermal characerization of polyoxymethylene based nanocomposites with zinc oxide. Book of Abstracts of the 19th International Conference on Composite Structures ICCS19, Porto, Portugal, September 5.-8., 2016, p. 20; DOI 10.15651/978-88-748-8977-8, ISSN 2421-2822, ISBN 97888748897782017.

K51. Remo Merijs Meri, Jānis Zicāns, Rita Berzina, Tatjana Ivanova, Ingars Reinholds, Ženija Roja, Hans-Peter Heim, Maik Feldmann. Fabrication and characterization of selected properties of the modified carbon nanotubes containing polymer composites/Modificētas oglekļa nanocaurulītes saturošu polimēru kompozītu iegūšana un izvēlētu īpašību raksturošana. Book of Abstracts of 33rd Scientific Conference of Institute of Solid State Physics of University of Latvia, February 22th-24th, 2017, Riga, Latvia, p. 97

K52. Egils Plūme, Roberts Maksimovs, Jānis Zicāns, Remo Merijs Meri. Prediction and experimental characterization of elastic properties of polymer nanocomposites/ Polimēru nanokompozītu elastisko īpašību prognozēšana un eksperimentāla raksturošana Book of Abstracts of 33rd Scientific Conference of Institute of Solid State Physics of University of Latvia, February 22th-24th, 2017, Riga, Latvia, p. 117

K53. Ingars Reinholds, Ženija Roja, Jānis Zicāns, Remo Merijs Meri. Electrical and mechanical properties or radiation cross-linked compositions with carbon nanotubes / Radiācijas šķērssaistītu kompozīciju ar oglekļa nanocaurulītēm elektriskās un mehāniskās īpašības Book of Abstracts of 33rd Scientific Conference of Institute of Solid State Physics of University of Latvia, February 22th-24th, 2017, Riga, Latvia, p. 98

K54. Ženija Roja, Ingars Reinholds, Jānis Zicāns, Remo Merijs Meri, Guna Vugule. Properties of electron beam crosslinked elastomeric composites with multi-walled carbon nanotubes/Īpašību novērtējums ar elektronu starojumu šķērssaistītām elastomēru kompozīcijām ar daudzslāņu oglekļa nanocaurulītēm Book of Abstracts of 33rd Scientific Conference of Institute of Solid State Physics of University of Latvia, February 22th-24th, 2017, Riga, Latvia, p. 120

K55. Aina Bernava, Skaidrīte Reihmane, Juris Bitenieks. The nonwoven fibres composites for geotextile / Neaustu šķiedrmateriālu kompozīti ģeotekstilam Book of Abstracts of 33rd Scientific Conference of Institute of Solid State Physics of University of Latvia, February 22th-24th, 2017, Riga, Latvia, p.118.

K56. Guna Vugule , Juris Bitenieks, Jānis Zicāns, Remo Merijs Meri, Ingars Reinholds, Ženija Roja, Hans-Peter Heim, Maik Feldmann. Elastic, electrical and thermal properties of polymer composites with ionic liquids modified carbon nanotubes / Ar jonu šķidrumiem modificētas oglekļa nanocaurulītes saturošu polimēru kompozītu elastiskās, elektriskās un termiskās īpašības Book of Abstracts of 33rd Scientific Conference of Institute of Solid State Physics of University of Latvia, February 22th-24th, 2017, Riga, Latvia, p. 119

K57. J. Bitenieks, R. Merijs Meri, J. Zicans, M. Kalnins. Characterization of polyethylene/carbon nanotube stress-strain and rheological properties. Book of Abstracts of International Conference Baltic Polymer Symposium 2017, 20-22 September, Tallinn, Estonia, p. 67

K58. T. Ivanova, R. Merijs-Meri, J. Zicans, I. Reinholds, Zh. Roja. Radiation modification of multiwall carbon nanotubes containing composites based on ethylene-octene copolymers Book of Abstracts of International Conference Baltic Polymer Symposium 2017, 20-22 September, Tallinn, Estonia, p.119

K59. Tatjana Ivanova, Ingars Reinholds, Remo Merijs Meri, Janis Zicans , Zhenija Roja Carbon nanofillers modified with thiophene derivatives for the development of ethylene-octene copolymer composites, Book of Abstracts of International Conference Functional Materials & Nanotechnologies FM&NT 2017, 24-27 April, Tartu, Estonia, p. 98

K60. J. Zicans, R. Merijs Meri, T. Ivanova, G. Vugule, I. Reinholds, Z. Roja, R. Maksimov. Structure, stress-strain properties and thermomechanical behaviour of radiation modified polyethylene compositions with carbon nanotubes. Book of Abstracts of International Conference on Composite Structures, 4-7 September, 2017, Paris, p. 286

K61. R. Merijs Meri, J. Zicans, T. Ivanova, R.Berzina, R. Saldabola, M. Kalnins, R. Maksimovs. Selected aspects of manufacturing and properties of acrylonitrile-butadiene-styrene copolymer and carbon nanotubes composites designed for fused filament fabrication. Book of Abstracts of International Conference on Composite Structures, 4-7 September, 2017, Paris, p.126

K62. Janis Zicans, Remo Merijs Meri, Ingars Reinholds, Guna Vugule, Ruta Saldabola, Tatjana Ivanova, Zhenija Roja, Egils Plume. Development and characterization of acrylonitrile-butadiene-styrene based composites with carbon nanotubes for smart 3d printing applications/ Proceedings of the 7th International Conference on Mechanics and Materials in Design, Albufeira/Portugal, 11-15 June, 2017, 501-502.

K63. Remo Merijs Meri, Janis Zicans, Ingars Reinholds, Tatjana Ivanova, Zhenija Roja, Robert Maksimov. Characterization of multi-walled carbon nanotubes reinforced ethylene-octene copolymer composites for design of novel heat shrinkable materials Proceedings of the 7th International Conference on Mechanics and Materials in Design, Albufeira/Portugal, 11-15 June, 2017, 499-500.

K64. Aina Bernava, Skaidrite Reihmane, Juris Bitenieks, Remo Merijs Meri. The Properties of Mesh Reinforced Nonwoven Composites. Conference Book of 26th International Baltic Conference Materials Engineering 2017, 26-27 October, 2017, Kaunas, Lithuania, p. 23-24

K65. Remo Merijs Meri, Janis Zicans, Tatjana Ivanova, Guna Vugule, Ingars Reinholds and Zhenija Roja. Acrylonitrile-butadiene-styrene based composites with multiwalled carbon nanotubes: manufacturing, characterization, applications Conference Book of 26th International Baltic Conference Materials Engineering 2017, 26-27 October, 2017, Kaunas, Lithuania, p. 29.

K66. Guna Vugule, Ingars Reinholds, Janis Zicans, Remo Merijs Meri. Development and Characterisation of Novel Conductive Nanofiller based on Multi-Walled Carbon Nanotubes grafted with Poly(3,4-Ethylenedioxythiophene). Book of Abstracts of RTU 58th International Conference «Materials Science and Applied Chemistry, MSAC 2017», 20 October, Riga, Latvia, p.81

K67. A.Berzina, V.Tupureina, M.Knite, Characterization of Electrical Properties of Carbon Black and Ethylene-Octene Copolymer Composites on Macro- and Nano- Scale, Book of Abstracts of the International Conference Functional Materials and Nanotechnologies 2017, Tartu, Estonia, April 24-27, 2017, P8, p.82

K68. K.Ozols, M.Knite, Electric Field Induced Capacitance Change of Air-Gap Capacitor Filled with Silicone Oil/Carbon Black Suspension, Book of Abstracts of the International Conference Functional Materials and Nanotechnologies 2017, Tartu, Estonia, April 24-27, 2017, P39, p. 113

K69. S.Stepina, G.Sakale, A.Berzina, M.Knite, Polymer/Nanostructured Carbon Composite Characterization for Usage as VOC Vapour Sensor, Book of Abstracts of the International Conference Functional Materials and Nanotechnologies 2017, Tartu, Estonia, April 24-27, 2017, P54, p. 128

K70. P.Lesnichenoks, A.Berzina, L.Grinberga, L.Jekabsons, J.Kleperis, M.Knite, G.Taurins, Complex Multilayer Graphene Structures for Hydrogen Energetics, Book of Abstracts of the International Conference Functional Materials and Nanotechnologies 2017, Tartu, Estonia, April 24-27, 2017, P104, p. 178

K71. Stepiņa, S., Šakale, G., Vlasenko, I., Vecstaudža, J., Knite, M. Polymer/carbon nanostructure composites quantum chemo-resistive sensor material elaboration for diesel fuel vapour detection, Abstracts of International Conference Frontiers in Polymer Science 2017, May 17-19, 2017, Seville, Spain, P2.099.

K72. Bērziņa, A., Tupureina, V., Knite, M. Characterization of the Peculiarities of Piezo-Resistive Effect of Elastomer/Highly Structured Carbon Black Composites by Electro Conducting Mode of Atomic Force Microscopy, Abstracts of International Conference Frontiers in Polymer Science 2017, Spain, Seville, 17.-19. May, 2017. online: 2017, 4.-4.lpp.

K73. K.Ozols, M.Knite, A.Bērziņa, Piezocapacitance Effect in Elastomer/Carbon Allotrope Composites, Abstracts of the 33nd Scientific conference of the Institute of Solid State Physics, University of Latvia, 2017, p 116

K74. A.Bērziņa, V.Tupureina, M.Knite, Correlation Findings between Piezoresistivity of Elastomer/Electro-Conductive Nanocarbon Composite and the Spatial Dispersion of Its Filler Particles, Abstracts of the 33nd Scientific conference of the Institute of Solid State Physics, University of Latvia, 2017, p 100

K75. M. Knite, A. Linarts, K. Ozols, L. Lapcinskis, I. Stalte, Electric field induced alignment of highly structured carbon black in silicone oil suspension, Institute of Solid State Physics Institute, Abstracts of the 33rd Scientific Conference, Latvia, Riga, February 22-24, 2017, p 99

K76. Remo Merijs Meri, Janis Zicans, Ingars Reinholds, Zhenija Roja, Krisjanis Smits, Jevgenijs Grabusenoks. Fabrication and characterization of thermal, electrical and mechanical properties of ethylene-octene copolymer composites with functionalized multi-walled carbon nanotubes, Book of Abstracts of 6th World Congress and Expo on Nanotechnology and Materials Science, April 16-18, 2018, Valencia, Spain, p. 34.

K77. K. Ozols, S. Scegoleva, M. Knite, Capacitance change of silicone oil/carbon black suspension filled measurement cell induced by electric field, Institute of Solid State Physics Institute, Abstracts of the 34rd Scientific Conference, Latvia, Riga, February 20-22, 2018, p 60

K78. L. Lapčinskis, S. Stepiņa, A. Linarts, M. Knite, Multiwalled CNT alignment under DC electrical field in PVAc polymer, 34th Scientific conference of the ISSP UL, 2018, Riga, Abstracts of the 34th Scientific Conference, p. 62.

K79. Santa Stepiņa, Gita Šakale, Māris Knite Rotācijas pārklāšanas metodes ātruma ietekme uz kvantu pretestības ķīmiskā sensora īpašībām. Latvijas Universitātes Cietvielu fizikas institūta 34. zinātniskās konferences tēzes, 20.-22. februāris, 2018, Rīga, Latvija, 59. lpp

K80. Bērziņa, A., Tupureina, V., Knite, M. Carbon Black – Ethylene Octene Copolymers Composite as Self-Regulating Heating Material, Abstracts of the 34th Scientific Conference, Latvia, Riga, 20.-22. February 2018. Riga: Institute of Solid State Physics University of Latvia, 2018, 61.-61.lpp.

PhD THESIS:

T1. Juris Bitenieks “Carbon Nanotube Based Thermoplastic Polymer Composites” (Sc. supervisor J. Zicāns), Defended in 7th of March, 2018, and Dr.sc.ing. in Chemical Technology has been awarded.

T2. Artis Linarts “Piezoresistive Properties of Elastomer Nanographite Composite Sensorelement Systems” (Sc. supervisor M. Knite), Defended in 9th of September, 2015, and Dr.phys. in Materials Sciences has been awarded.

T3. Agnese Ābele “Structure and Properties of Polyoxymethylenes, Ethylene-Octene Copolymers and Nano Zinc Oxide Composites” (Sc. supervisor J. Zicāns), Defended in 3rd of June, 2015, and Dr.sc.ing. in Materials Sciences has been awarded.

T4. Santa Stepiņa is 4th year doctoral student and her dissertation “Fuel and other volatile organic compound (VOC) detection with quantum resistive sensors (QRS) made of conductive polymer nanocomposites (CPC)” (Sc. supervisor M. Knite) has been pre-defended in the scientific seminar of the Institute of Technical Physics in 17.05.2018. (Planned to defend in September 2018)

T5. Kaspars Ozols is pretendent to doctoral degree and has been elaborated his thesis „ Electrical and optical properties of polymer/inorganic nanoparticle composites” (Planned to defend in 2018)

MASTER’S THESIS:

M1. Elza Dilbeka “Mechanical and thermal properties of thermoplastic starch nanocomposites with layered silicate nanofillers” (Sc. supervisor R. Merijs Meri), defended in RTU in 2016.

M2. Edvards Saušs “Manufacturing and characterization of properties of dynamically cross-linked ethylene-octene copolymer nanocomposites with layered silicate nanofiller” (Sc. supervisor R. Merijs Meri), defended in RTU in 2016.

M3. Astrīda Bērziņa “Investigation of dispersion of electroconductive nanofiller particles in elastomer composites with atomic force microscope” (Sc. supervisor M. Knite), defended in RTU in 2016.

M4. Aleksandrs Magdičš. “Thrmophysical and structural properties of modified polyethylene compositions with carbon nanotubes”. (Sc. supervisor I. Reinholds), defended in University of Latvia in 2015.

M5. Arvis Kokins “Influence of ethylene-octene copolymer and zinc oxide on the properties of recycled polypropylene” (Sc. supervisor R. Merijs Meri), defened in RTU in 2015.

M6. Pēteris Lesničenoks “Research of hydrogen storage in meso-porous large surface area materials for applications in automotive industry” (Sc. supervisors J. Kleperis, R. Merijs Meri), defended in RTU in 2015.

M7. Sandra Guzlēna “Advanced silconrubber and nanostructured carbon composites for volatile organic compounds detection” (Sc. supervisor G. Šakale), defended in RTU in 2015.

COMMERCIAL CONTRACTS:

L1. Commercial contract Nr. L8272 on the evaluation of 3D printability and characterization of environmentally friendly polymer materials with SIA Baltic 3d.EU, EUR 4840 (Leader J. Zicāns)

L2. Commercial contract Nr. L8296 on the evaluation of 3D printability and characterization of environmentally friendly polymer materials with SIA Baltic 3d.EU EUR 2420 (Leader J. Zicāns)

L3. Commercial contract Nr. L8329 (7.3.95/ID1024) “Investigations on the composition of five commercially available sand products and sand available in Latvia” on the development of 3D building sand toy with innovative polymer admixture with SIA “Green Industry Innovation center”. EUR 2940 (Leader J. Zicāns)

L4 Commercial contract Nr. L6388 on the development and characterization of polymer concentrates with SIA “Polymers” EUR 2953 (Leader J. Zicāns)

L5. Commercial contract Nr. L8325 on the investigation of the materials used in constructor systems, polymers, theri properties and their compliance with children toys with SIA “Green Industry Innovation center” EUR 1355 (Leader. V. Tupureina)

L6. Commercial contract Nr. L8308 with SIA Controlit Factory on the properties of polymer composite materials for covering of engineering structures/buildings EUR 968 (Leader J. Zicāns)

L7. Commercial contract Nr. L8307 “Testing of antielectrostatic properties of the floor in Ventspils High Technology Park” EUR 143,20 (Leader M. Knite)

L8. Commercial contract Nr. L8510 “Measurement of transparency spectra of stained glasses” EUR 136,50 (Leader M. Knite)