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Journal Article Facile Functionalization of Poly(Dimethylsiloxane) Elastomer by Varying Content of Hydridosilyl Groups in a Crosslinker
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Authors
Seung Koo Park, Bong Je Park, Mee Jeong Choi, Dong Wook Kim, Jae Woong Yoon, Eun Jin Shin, Sungryul Yun, Suntak Park
Issue Date
2019-11
Citation
Polymers, v.11, no.11, pp.1-11
ISSN
2073-4360
Publisher
MDPI
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.3390/polym11111842
Abstract
Crosslinked poly(dimethylsiloxane) (PDMS) has been widely used as a dielectric elastomer for electrically driven actuators because it exhibits high elasticity, low initial modulus, and excellent moldability in spite of low dielectric constant. However, further improvement in the characteristics of the PDMS elastomer is not easy due to its chemical non-reactivity. Here, we report a simple method for functionalizing the elastomer by varying content of hydridosilyl groups in PDMS acted as a crosslinker. We synthesized poly(dimethylsiloxane-co-methylvinylsiloxane) (VPDMS) and poly(dimethylsiloxane-co-methylsiloxane) (HPDMS). Tri(ethylene glycol) divinyl ether (TEGDE) as a polar molecule was added to the mixture of VPDMS and HPDMS. TEGDE was reacted to the hydridosilyl group in HPDMS during crosslinking between VPDMS and HPDMS in the presence of platinum as a catalyst. Permittivity of the crosslinked film increased from ca. 25 to 36 pF/m at 10 kHz without a decline in other physical properties such as transparency and elasticity (T > 85%, E ~150 kPa, 琯 ~270%). It depends on the hydridosilyl group content of HPDMS. The chemical introduction of a new molecule into the hydridosilyl group in HPDMS during crosslinking would provide a facile, effective method of modifying the PDMS elastomers.
KSP Keywords
Dielectric elastomer(DE), Divinyl ether, Initial modulus, It depends, PDMS elastomer, Physical Properties, electrically driven, ethylene Glycol(Poly), high elasticity, low dielectric constant, polar molecule
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