Počet záznamů: 1  

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

  1. 1.
    SYSNO ASEP0531985
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevMeltable 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
    Tvůrce(i) 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
    Číslo článku109962
    Zdroj.dok.European Polymer Journal. - : PERGAMON-ELSEVIER SCIENCE LTD - ISSN 0014-3057
    Roč. 137, 15 August (2020), s. 1-23
    Poč.str.23 s.
    Jazyk dok.eng - angličtina
    Země vyd.GB - Velká Británie
    Klíč. slovareversible networks ; self-assembly ; self-healing
    Vědní obor RIVCD - Makromolekulární chemie
    Obor OECDPolymer science
    CEPGA19-04925S GA ČR - Grantová agentura ČR
    Způsob publikováníOmezený přístup
    Institucionální podporaUMCH-V - RVO:61389013
    UT WOS000567604100020
    EID SCOPUS85089956459
    DOI10.1016/j.eurpolymj.2020.109962
    AnotaceElastomers 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.
    PracovištěÚstav makromolekulární chemie
    KontaktEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Rok sběru2021
    Elektronická adresahttps://www.sciencedirect.com/science/article/pii/S0014305720316761?via%3Dihub
Počet záznamů: 1