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.
SYSNO ASEP 0531985 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název 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 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) RIDČíslo článku 109962 Zdroj.dok. European Polymer Journal. - : Elsevier - ISSN 0014-3057
Roč. 137, 15 August (2020), s. 1-23Poč.str. 23 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova reversible networks ; self-assembly ; self-healing Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GA19-04925S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000567604100020 EID SCOPUS 85089956459 DOI https://doi.org/10.1016/j.eurpolymj.2020.109962 Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2021 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0014305720316761?via%3Dihub
Počet záznamů: 1