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Meltable copolymeric elastomers based on polydimethylsiloxane with multiplets of pendant liquid-crystalline groups as physical crosslinker: a self-healing structural material with a potential for smart applications

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    SYSNO ASEP0531985
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleMeltable copolymeric elastomers based on polydimethylsiloxane with multiplets of pendant liquid-crystalline groups as physical crosslinker: a self-healing structural material with a potential for smart applications
    Author(s) Horodecka, Sabina (UMCH-V) RID, ORCID
    Strachota, Adam (UMCH-V) RID, ORCID
    Mossety-Leszczak, B. (PL)
    Šlouf, Miroslav (UMCH-V) RID, ORCID
    Zhigunov, Alexander (UMCH-V) RID, ORCID
    Vyroubalová, Michaela (UMCH-V) ORCID
    Kaňková, Dana (UMCH-V)
    Netopilík, Miloš (UMCH-V) RID
    Article number109962
    Source TitleEuropean Polymer Journal. - : Elsevier - ISSN 0014-3057
    Roč. 137, 15 August (2020), s. 1-23
    Number of pages23 s.
    Languageeng - English
    CountryGB - United Kingdom
    Keywordsreversible networks ; self-assembly ; self-healing
    Subject RIVCD - Macromolecular Chemistry
    OECD categoryPolymer science
    R&D ProjectsGA19-04925S GA ČR - Czech Science Foundation (CSF)
    Method of publishingLimited access
    Institutional supportUMCH-V - RVO:61389013
    UT WOS000567604100020
    EID SCOPUS85089956459
    DOI10.1016/j.eurpolymj.2020.109962
    AnnotationElastomers with strong physical crosslinks were prepared, based on alternating polydimethylsiloxane (PDMS) spacer segments and pendant quartets of mesogenic building blocks (LC) of azobenzene type. They are structurally related to the well-studied polymers with pendant-chain LC units (light-sensitive actuators), but are generally highly different: The LC units make up only a small volume fraction in our materials and they do not generate elastic energy upon irradiation, but they act as physical crosslinkers with thermotropic properties. Our elastomers lack permanent chemical crosslinks – their structure is fully linear (with some dangling units). The aggregation of the relatively rare and spatially separated LC quartets (of small mesogen units) nevertheless proved to be an efficient crosslinking mechanism: The most attractive product displays a rubber plateau extending over 100 °C, melts near 70 °C and is soluble in organic solvents. The LC nano-aggregates were also found to be responsible for a continuous temperature region of phase transitions, e.g. two gel points observed by rheology. The physical crosslinks are reversibly disconnected by large mechanical strain at room temperature, but they undergo self-healing, also after sample disruption. The elastomers might be of interest for the development of passive smart materials (e.g. meltable rubbers for 3D-printing, or thermo-reversible visco-elastic mechanical coupling). Our study focuses on the comparison of physical properties and structure-property relationships in two systems, with long and with short PDMS spacer segments.
    WorkplaceInstitute of Macromolecular Chemistry
    ContactEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Year of Publishing2021
    Electronic addresshttps://www.sciencedirect.com/science/article/pii/S0014305720316761?via%3Dihub
Number of the records: 1  

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