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Exploitation of the hard/soft segments ratio in thermoplastic polyurethane (TPU) for the tuning of electrical and mechanical properties of expanded graphite (EG) based composites
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SYSNO ASEP 0507000 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Exploitation of the hard/soft segments ratio in thermoplastic polyurethane (TPU) for the tuning of electrical and mechanical properties of expanded graphite (EG) based composites Author(s) Piana, Francesco (UMCH-V) RID, ORCID
Pionteck, J. (DE)Article number 878 Source Title SN Applied Sciences. - : Springer - ISSN 2523-3963
Roč. 1, č. 8 (2019)Number of pages 10 s. Language eng - English Country DE - Germany Keywords composites ; elastomers ; nanoparticles Subject RIV CG - Electrochemistry OECD category Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis) R&D Projects TE01020022 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000476622600002 DOI https://doi.org/10.1007/s42452-019-0908-3 Annotation Composite materials based on three kinds of commercial thermoplastic polyurethanes (TPUs) and electrically conductive expanded graphite (EG) were prepared by melt-mixing. The TPUs differed mainly in hard/soft segment ratio, resulting in different polarity and crystallinity. These parameters were exploited to prepare composite materials with different percolating path structure, whose characteristics were thoroughly analysed. Test specimens were prepared by compression moulding and their electrical, thermal and mechanical properties, as dependent on filler content, were analysed. The electrical behaviour was correlated to the morphologies. The results showed how EG promoted and modified the crystallization, resulting in enhanced hardness but reduced toughness of the material. Moreover, EG segregation was observed in the TPU with the highest HS content which already promoted percolating paths at EG concentration below 2 wt% (1.1 vol%) and showed a resistivity between 105 and 104 Ω cm, while in TPU with low crystallinity the percolation was shifted to above 4 wt% EG and the resistivity reached values slightly over 105 Ω cm at 8 and 10 wt% EG. These peculiarities enabled easy management of a broad range of industrial application such as antistatic coatings, mechanically reinforced insulators, and electrical conductive connectors using a few pristine materials. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2020 Electronic address https://link.springer.com/content/pdf/10.1007%2Fs42452-019-0908-3.pdf
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