Number of the records: 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.
SYSNO ASEP 0531985 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title 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 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) RIDArticle number 109962 Source Title European Polymer Journal. - : Elsevier - ISSN 0014-3057
Roč. 137, 15 August (2020), s. 1-23Number of pages 23 s. Language eng - English Country GB - United Kingdom 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) Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000567604100020 EID SCOPUS 85089956459 DOI https://doi.org/10.1016/j.eurpolymj.2020.109962 Annotation Elastomers 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. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://www.sciencedirect.com/science/article/pii/S0014305720316761?via%3Dihub
Number of the records: 1