Number of the records: 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
- 1.
SYSNO ASEP 0533852 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title 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 Author(s) 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)Article number 2476 Source Title Polymers. - : MDPI
Roč. 12, č. 11 (2020), s. 1-27Number of pages 27 s. Language eng - English Country CH - Switzerland Keywords reversible networks ; self-assembly ; self-healing Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GA19-04925S GA ČR - Czech Science Foundation (CSF) TN01000008 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000594408900001 EID SCOPUS 85094122733 DOI 10.3390/polym12112476 Annotation Physically 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). Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://www.mdpi.com/2073-4360/12/11/2476
Number of the records: 1