A5038220761- Polymer Nanocomposites and Properties
- Material Properties and Applications
- Polymer crystallization and properties
- Carbon Nanotubes in Composites
- biodegradable polymer synthesis and properties
- Tribology and Wear Analysis
- Polymer Nanocomposite Synthesis and Irradiation
- Conducting polymers and applications
- Polymer Science and Applications
- Natural Fiber Reinforced Composites
- Nanotechnology research and applications
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Electromagnetic wave absorption materials
- Fiber-reinforced polymer composites
- Synthesis and properties of polymers
- Epoxy Resin Curing Processes
- Silicone and Siloxane Chemistry
- Polymer composites and self-healing
- Nanocomposite Films for Food Packaging
- Asphalt Pavement Performance Evaluation
- Infrastructure Maintenance and Monitoring
- Dielectric materials and actuators
- Food composition and properties
- X-ray Diffraction in Crystallography
- Polymer Science and PVC
Riga Technical University
2015-2024
Institute for Polymer Mechanics
2016-2022
University of Latvia
2016-2018
West Pomeranian University of Technology
2018
Latvian State Institute of Wood Chemistry
2018
Incorporating enzymes into calcium alginate beads is an effective method to immobilise them and preserve, at the same time, their catalytic activity. Sodium was mixed with Aspergillus ficuum tannase in aqueous solution, tannase-loaded were prepared using a simple droplet-based microfluidic system. Extensive experimental analysis carried out characterise samples. Microscopic imaging revealed morphological differences between surfaces of bare matrix beads. Thermal allowed assessing hydration...
A comprehensive analysis of electrical, electromagnetic (EM), mechanical, and thermal properties epoxy resin composites filled with 0.25–2.0 wt. % carbon additives characterized by high surface area, both nano-sized, like nanotubes (CNTs) black (CBH), micro-sized exfoliated graphite (EG), was performed. We found that the physical CNTs- CBH-based increased all together filler content even more clearly for CBH than CNTs. In case EG-based composites, good correlation between amount observed...
Developing polyols derived from natural sources and recycling materials attracts great interest for use in replacing petroleum-based polyurethane production. In this study, rigid (PUR) foams with various isocyanate indices were obtained based on rapeseed oil polyethylene terephthalate (RO/PET). The properties of the prepared PUR investigated, effect index was evaluated. closed-cell content water absorption not impacted by change index. most significant increasing dimensional stability...
This study evaluates the environmental and economic benefits of recycled asphalt (RA), pavement (RAP), warm mix technology (WMA), wood fly ash (WFA), crumb rubber (CR) from end-of-life tires kraft lignin in individual courses a full-depth flexible pavement. The performs LCA LCCA for 19 mixtures (cradle-to-site) six scenarios (cradle-to-cradle). Four impact categories are considered: quantities materials used, global warming potential (GWP), cumulative energy demand (CED) road owner costs. Of...
A polymer nanocomposite was produced by ultrasonic-assisted dispersion of multiwalled carbon nanotubes (MWCNTs) in a polycarbonate matrix using p-xylene and dichloromethane as the solvents. The filler loading varied from 1 to 3 wt % order examine effect MWCNTs on structure properties composites. nanocomposites were characterized DSC, DTA, TGA, UV-vis, FTIR Raman spectroscopy evaluate changes induced matrix. measurements confirmed presence dispersed phase composite films, while TGA DSC...
Rejuvenators improve the performance of reclaimed asphalt mixtures but relatively little is known about their long-term aging characteristics. This study evaluated effect four different rejuvenators on characteristics 100% mixtures. Rheological tests extracted bitumen revealed that tall oil-based rejuvenator showed highest reduction and petroleum-based lowest in stiffness binder long term. At lower strain levels, fatigue life calculated from linear amplitude sweep test was significantly...
The birch (Betula spp.) outer bark is a valuable product rich in betulin. After removal of betulin extractives, suberin containing tissues are left. Suberin biopolyester built from α,ω-bifunctional fatty acids (suberinic acids), which after depolymerization together with lignocarbohydrate complex potential adhesive as side-stream (residue) obtaining suberinic for polyol synthesis. In this work, we studied the utilization possibilities particleboards said residue obtained by four different...
The exploitation of beidellite clay (BDT), used as a nanofiller in the preparation poly(butylene succinate) (PBS)/organoclay biodegradable nanocomposites, was investigated. A series bionanocomposites with various loadings organoclay (3CTA-BDT) were prepared by situ polycondensation reaction between succinic anhydride (SuAh) and 1,4-butanediol (1,4-BD) at atmospheric pressure refluxing decalin azeotropic removal water, catalyzed non-toxic bismuth chloride (BiCl3). X-ray diffraction (XRD)...
The reduction of tissue cytotoxicity and the improvement cell viability are utmost significance, particularly in realm green chemistry. Despite substantial progress, threat local infections remains a concern. Therefore, hydrogel systems that provide mechanical support harmonious balance between antimicrobial efficacy greatly needed. Our study explores preparation physically crosslinked, injectable, hydrogels using biocompatible hyaluronic acid (HA) ε-polylysine (ε-PL) different weight ratios...
In the context of sustainable materials, this study explores effects accelerated weathering testing and bacterial biodegradation on poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/rapeseed microfiber biocomposites. Accelerated weathering, simulating outdoor environmental conditions, biodegradation, representing natural degradation processes in soil, were employed to investigate changes mechanical, thermal morphological properties these materials during its post-production life cycle....
Proton exchange membranes (PEM), which have been commonly used in fuel cells raised interest for the application harsh environments involving ionizing radiation. Therefore, radiation stability and ability to sustain their functionality under environment are of great interest. Within this study, electron beam irradiation dose range from 50 500kGy was evaluate effects on physico-chemical mechanical properties two types PEM: commercial Nafion®117 sulfonated poly(ether-ether-ketone) (SPEEK) with...
This work is devoted to the fabrication of p-type polyvinyl alcohol (PVA)-based flexible thermoelectric composites using multiwall carbon nanotubes-antimony telluride (MWCNT-Sb2Te3) hybrid filler, study thermoelectrical and mechanical properties these composites, application in two types (planar radial) generators (TEG) combination with previously reported PVA/MWCNT-Bi2Se3 composites. While power factors PVA/MWCNT-Sb2Te3 15 wt.% filler were found be similar, composite 25 showed a ~2 times...
The current research is devoted to the investigation of plasticization polyhydroxybutyrate (PHB) and polyhydroxybutyrate-co-hydroxyvalerate (PHBV) with triethyl citrate (TEC). Three different PHB or PHBV-based systems 10, 20, 30 wt.% TEC were prepared by two-roll milling. effect on rheological, thermal, mechanical, calorimetric properties developed compression-molded was determined. It revealed that addition significantly influenced melting behavior both polyhydroxyalkanoates (PHA), reducing...
This research is devoted to the fabrication of polyvinyl alcohol (PVOH) based n-type thermoelectric composites with innovative hybrid bismuth selenide-multiwalled carbon nanotube (Bi2Se3-MWCNT) fillers for application in flexible devices. Hybrid were synthesized by direct deposition Bi2Se3 on multiwalled nanotubes using a physical vapor method, thus ensuring electrical contact between and Bi2Se3. The Seebeck coefficient prepared PVOH/Bi2Se3-MWCNT was found be comparable that thin films,...
According to scientific research from different countries, crumb rubber obtained end-of-life tires (ELT) during processing can improve the properties of asphalt mixture, thereby extending service life road surface. This paper presents modification bitumen with industrial waste. The for roads is considered one most suitable and popular approaches. describes details using types as modifiers. modified bitumen’s main physical mechanical characteristics were determined after conventional tests:...
Oat and spelt husks (OH SH, respectively) lignocellulosic biomass derived fillers have been compared with commercial wood flour (WF) in respects to their morphology, chemical composition, bulk density, aspect ratio, thermal stability. OH SH obtained by both mechanical milling steam explosion auto‐hydrolysis treatment at various processing conditions. Reinforcement efficiency of on the flexural properties maleic acid‐grafted polypropylene (PPgMA) compatibilized (PP) composites is that WF. The...