Počet záznamů: 1  

Low-temperature meltable elastomers based on linear polydimethylsiloxane chains alpha, omega-terminated with mesogenic groups as physical crosslinkers: a passive smart material with potential as viscoelastic coupling. Part I: synthesis and phase behavior

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    SYSNO ASEP0533852
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevLow-temperature meltable elastomers based on linear polydimethylsiloxane chains alpha, omega-terminated with mesogenic groups as physical crosslinkers: a passive smart material with potential as viscoelastic coupling. Part I: synthesis and phase behavior
    Tvůrce(i) Horodecka, Sabina (UMCH-V) RID, ORCID
    Strachota, Adam (UMCH-V) RID, ORCID
    Mossety-Leszczak, B. (PL)
    Strachota, Beata (UMCH-V) RID
    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
    Walterová, Zuzana (UMCH-V)
    Číslo článku2476
    Zdroj.dok.Polymers
    Roč. 12, č. 11 (2020), s. 1-27
    Poč.str.27 s.
    Jazyk dok.eng - angličtina
    Země vyd.CH - Švýcarsko
    Klíč. slovareversible networks ; self-assembly ; self-healing
    Vědní obor RIVCD - Makromolekulární chemie
    Obor OECDPolymer science
    CEPGA19-04925S GA ČR - Grantová agentura ČR
    TN01000008 GA TA ČR - Technologická agentura České republiky
    Způsob publikováníOpen access
    Institucionální podporaUMCH-V - RVO:61389013
    UT WOS000594408900001
    EID SCOPUS85094122733
    DOI10.3390/polym12112476
    AnotacePhysically crosslinked low-temperature elastomers were prepared based on linear polydimethylsiloxane (PDMS) elastic chains terminated on both ends with mesogenic building blocks (LC) of azobenzene type. They are generally (and also structurally) highly different from the well-studied LC polymer networks (light-sensitive actuators). The LC units also 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. The aggregation of the relatively rare, small, and spatially separated terminal LC units nevertheless proved to be a considerably strong crosslinking mechanism. The most attractive product displays a rubber plateau extending over 100 °C, melts near 8 °C, and is soluble in organic solvents. The self-assembly (via LC aggregation) of the copolymer molecules leads to a distinctly lamellar structure indicated by X-ray diffraction (XRD). This structure persists also in melt (polarized light microscopy, XRD), where 1–2 thermotropic transitions occur. The interesting effects of the properties of this lamellar structure on viscoelastic and rheological properties in the rubbery and in the melt state are discussed in a follow-up paper (“Part II”). The copolymers might be of interest as passive smart materials, especially as temperature-controlled elastic/viscoelastic mechanical coupling. Our study focuses on the comparison of physical properties and structure–property relationships in three systems with elastic PDMS segments of different length (8.6, 16.3, and 64.4 repeat units).
    PracovištěÚstav makromolekulární chemie
    KontaktEva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
    Rok sběru2021
    Elektronická adresahttps://www.mdpi.com/2073-4360/12/11/2476
Počet záznamů: 1