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
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F20%3A00531985" target="_blank" >RIV/61389013:_____/20:00531985 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/20:10424680
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0014305720316761?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0014305720316761?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.eurpolymj.2020.109962" target="_blank" >10.1016/j.eurpolymj.2020.109962</a>
Alternative languages
Result language
angličtina
Original language name
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
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
<a href="/en/project/GA19-04925S" target="_blank" >GA19-04925S: Advanced smart and self-healing nanocomposite hydrogels sensitive to external stimuli</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Polymer Journal
ISSN
0014-3057
e-ISSN
—
Volume of the periodical
137
Issue of the periodical within the volume
15 August
Country of publishing house
GB - UNITED KINGDOM
Number of pages
23
Pages from-to
1-23
UT code for WoS article
000567604100020
EID of the result in the Scopus database
2-s2.0-85089956459