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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 ASEP0507000
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleExploitation 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 number878
    Source TitleSN Applied Sciences. - : Springer - ISSN 2523-3963
    Roč. 1, č. 8 (2019)
    Number of pages10 s.
    Languageeng - English
    CountryDE - Germany
    Keywordscomposites ; elastomers ; nanoparticles
    Subject RIVCG - Electrochemistry
    OECD categoryElectrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
    R&D ProjectsTE01020022 GA TA ČR - Technology Agency of the Czech Republic (TA ČR)
    Method of publishingOpen access
    Institutional supportUMCH-V - RVO:61389013
    UT WOS000476622600002
    DOI https://doi.org/10.1007/s42452-019-0908-3
    AnnotationComposite 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.
    WorkplaceInstitute of Macromolecular Chemistry
    ContactEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Year of Publishing2020
    Electronic addresshttps://link.springer.com/content/pdf/10.1007%2Fs42452-019-0908-3.pdf
Number of the records: 1  

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