Vides ietekme uz viedo ar oglekļa nanopildvielām modificētu kompozītu un šķiedru plastikātu fizikālajām īpašībām strukturāliem pielietojumiem / Environmental effects on physical properties of smart composites and FRP modified by carbonaceous nanofillers for structural applications

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12M Progress Report. Period concerning this report: 01.01.2018-31.12.2018.
(Zenodo, 2018-12-30) Glaskova-Kuzmina, Tatjana
During the first year of the project the main purpose was to choose, purchase and develop investigated materials: epoxy resin and at least two carbon nanofillers (nanotubes, nanofibres and/or graphene). The most promising material solution and the most optimal processing route were chosen and reported. Then two sets of epoxy and NC specimens were developed during Mobilities#2-3 to partner organization, Institute for Polymers, Composites and Biomaterials (Portici, Italy). The test specimens of epoxy and NC were subjected to environmental ageing: water absorption at 70 °C until equilibrium water content and heating at 70 °C, then freezing at ap. -20 °C to evaluate the most environmentally stable NC configuration. Based on preliminary results (without results after freezing), the most environmentally stable NC was epoxy filled with 0.1 wt. % of CNT/CNF, which had the lowest effect of temperature and moisture on thermal and electrical conductivities, along with the lowest equilibrium water content and diffusivity.
24M Progress Report. Period concerning this report: 01.01.2019-31.12.2019.
(Zenodo, 2019-12-13) Glaskova-Kuzmina, Tatjana
During the second year of the project the main purpose was to design and develop smart fibre-reinforced plastic (FRP) plate by using the most environmentally stable nanocomposite (NC) configuration. As a result, within the support of collaboration partner Institute for Polymers, Composites and Biomaterials (IPCB, Portici, Italy) during Mobility#4 four basalt FRP plates were produced: two [0]8 plates impregnated with the epoxy or the NC, and two [0/45/90/-45]2 also impregnated with the epoxy or the NC, and two [0/45/90/-45]2. Additionally, a set of the specimens for the epoxy and epoxy filled with 0.1 wt.% of hybrid nanofiller (carbon nanotubes and nanofibers in the ratio 1:1) was developed for full year environmental ageing. The characterization of flexural, thermophysical and electrical properties was performed for all materials in uncondensed state (before the environmental ageing). After that the first season of environmental ageing (summer, water absorption at room temperature) has been started for all materials. Moreover, water absorption at 20 and 50 ºC until equilibrium has been performed for all materials.
Cyclic moisture sorption and its effects on the thermomechanical properties of epoxy and epoxy/MWCNT nanocomposite
(MDPI, 2019-08-23) Glaskova-Kuzmina, Tatjana; Aniskevich, Andrey; Sevcenko, Jevgenijs; Borriello, Anna; Zarrelli, Mauro
The aim of this work was to reveal the moisture absorption–desorption–resorption characteristics of epoxy and epoxy-based nanocomposites filled with different multiwall carbon nanotubes (MWCNTs) by investigating the reversibility of the moisture effect on their thermomechanical properties. Two types of MWCNTs with average diameters of 9.5 and 140 nm were used. For the neat epoxy and nanocomposite samples, the moisture absorption and resorption tests were performed in atmospheres with 47%, 73%, and 91% relative humidity at room temperature. Dynamic mechanical analysis was employed to evaluate the hygrothermal ageing effect for unconditioned and environmentally “aged” samples. It was found that moisture sorption was not fully reversible, and the extent of the irreversibility on thermomechanical properties was different for the epoxy and the nanocomposite. The addition of both types of MWCNTs to the epoxy resin reduced sorption characteristics for all sorption tests, improved the hygrothermal and reduced the swelling rate after the moisture absorption–desorption.
Dissemination/Communication Plan. Period concerning the plan: 01.01.2018-31.12.2020.
(Zenodo, 2018-12-30) Glaskova-Kuzmina, Tatjana
The plan concerning different dissemination/communication activities during three years of the project implementation is given. Scientific results are proposed to be disseminated in well-recognized bi-annual international conferences, such as European Conference on Composite Materials (ECCM) and International Conference on Composite Materials (ICCM). Self-archiving of the main project results is planned within subject-based open-access repositories, such as ResearchGate and Zenodo. Two scientific publications in Q1-Q2 SCI journals and two popular scientific publications in popular scientific Latvian journals are foreseen. All data files obtained within the project are to be stored in central database, e.g. Dropbox. For wide audience the information will be regularly provided on professional Facebook profile of the post-doctorate Dr. Sc. Ing. T. Glaskova-Kuzmina.
Dissemination/Communication Report. Period concerning this report: 01.01.2018-31.12.2018.
(Zenodo, 2018-12-20) Glaskova-Kuzmina, Tatjana
During the first year of the project implementation different dissemination/communication activities were carried out. First scientific results were presented on the 18th European Conference on Composite Materials (ECCM). For the dissemination of information among general public professional FACEBOOK profile was developed. Additionally, for better dissemination of project scientific results project profile “Environmental effects on physical properties of smart composites and fibre-reinforced plastics modified by carbonaceous nanofillers for structural applications” was developed at open-access database ZENODO (www.zenodo.org) under community POSTDOC-Latvia providing open-access to all published materials. Both profiles will be regularly updated with actual project results during full project implementation period.
Dissemination/Communication Report. Period concerning this report: 01.01.2019-31.12.2019.
(Zenodo, 2019-12-03) Glaskova-Kuzmina, Tatjana
During the second year of the project implementation different dissemination/communication activities were carried out. The scientific results of the project were presented on two conferences ICSAAM 2019, September 12-15, 2019 (Ischia, Italy) and DFMN 2019, November 19-22, 2019 (Moscow, Russia). Based on the conference presentation two conference full papers were prepared and submitted for the publication in conference proceedings having open access and indexed in Scopus. One scientific publication was published in the special issue of Polymers (Q1 open access journal, IF 3.2). For the dissemination of information among general public professional FACEBOOK profile was regularly updated with press releases regarding the project activities. The project profile “Environmental effects on physical properties of smart composites and fibre-reinforced plastics modified by carbonaceous nanofillers for structural applications” was updated with annual reports at open-access database ZENODO (www.zenodo.org) under community POSTDOC-Latvia providing open-access to all published materials. Both profiles will be also regularly updated with actual project results during the last year of project implementation.
Environmental effects on mechanical, thermophysical and electrical properties of epoxy resin filled with carbon nanofillers
(AIP Publishing, 2019-12-12) Glaskova-Kuzmina, Tatjana; Aniskevich, Andrey; Sevcenko, Jevgenijs; Zotti, Aldobenedetto; Borriello, Anna; Zarrelli, Mauro
The aim of this work was to establish the effect of environmental factors (moisture and temperature) on some mechanical, electrical and thermal properties of epoxy-based composites filled with carbon nanofillers: nanotubes (CNT), nanofibers (CNF) and hybrid nanofiller (nanotubes/nanofibers in the ratio 1:1) and to reveal the most environmentally stable NC. First, the nanocomposites (NC) containing different nanofiller contents were prepared to evaluate electrical percolation threshold and to choose NC at certain electrical conductivity for further characterization of the physical properties in initial state and during/after environmental ageing. The environmental ageing consisted of water absorption at 70 °C until equilibrium moisture content reached all samples in 4 weeks and 2) heating at 70 °C for the same time, and 3) freezing at -20 °C for 8 weeks. Two concurrent factors, temperature and moisture, led to post-curing of all materials studied without significant plastization. Some positive nanofiller effects were found for sorption, mechanical and thermophysical characteristics of RTM6 epoxy resin. Based on experimental results, the most environmentally stable NC was epoxy filled with 0.1 wt. % of CNT/CNF hybrid, which had the lowest effect of temperature and moisture on thermal and electrical conductivities, along with the lowest equilibrium water content and diffusivity.
Flexural properties of the epoxy resin filled with single and hybrid carbon nanofillers
(IOP Publishing, 2020-01-07) Glaskova-Kuzmina, T.; Aniskevich, A.; Zotti, A.; Borriello, A.; Zarrelli, M.
The aim of this paper was to estimate the effect of moisture and temperature on the flexural properties of the epoxy filled with single and hybrid carbon nanofillers (CNTs and CNFs) and to reveal the most environmentally stable NC. Water absorption at 70 °C until equilibrium moisture content and heating at 70 °C for 4 weeks were followed by freezing at - 20 °C for 8 weeks. Microstructural characterization of optical images revealed homogeneous dispersion of all carbon nanofillers in the epoxy resin at microscale. Positive nanofiller effects were found for sorption, flexural and thermophysical characteristics of the epoxy resin. The most environmentally stable NC was epoxy filled with 0.1 wt. % of CNTs/CNFs hybrid, which had the lowest effect of temperature and moisture on mechanical characteristics, along with the lowest equilibrium water content and diffusivity.
Hydrothermal Aging of an Epoxy Resin Filled with Carbon Nanofillers
(MDPI, 2020-05-18) Glaskova-Kuzmina, Tatjana; Aniskevich, Andrey; Papanicolaou, George; Portan, Diana; Zotti, Aldobenedetto; Borriello, Anna; Zarrelli, Mauro
The effects of temperature and moisture on flexural and thermomechanical properties of neat and filled epoxy with both multiwall carbon nanotubes (CNT), carbon nanofibers (CNF), and their hybrid components were investigated. Two regimes of environmental aging were applied: Water absorption at 70 °C until equilibrium moisture content and thermal heating at 70 °C for the same time period. Three-point bending and dynamic mechanical tests were carried out for all samples before and after conditioning. The property prediction model (PPM) was successfully applied for the prediction of the modulus of elasticity in bending of manufactured specimens subjected to both water absorption and thermal aging. It was experimentally confirmed that, due to addition of carbon nanofillers to the epoxy resin, the sorption, flexural, and thermomechanical characteristics were slightly improved compared to the neat system. Considering experimental and theoretical results, most of the epoxy composites filled with hybrid carbon nanofiller revealed the lowest effect of temperature and moisture on material properties, along with the lowest sorption characteristics.

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