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Facile Functionalization of Poly(Dimethylsiloxane) Elastomer by Varying Content of Hydridosilyl Groups in a Crosslinker

1
Human Enhancement & Assistive Technology Research Section, Artificial Intelligence Research Laboratory, Electronics and Telecommunications Research Institute, 218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea
2
Advanced Materials Division, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea
*
Authors to whom correspondence should be addressed.
Polymers 2019, 11(11), 1842; https://doi.org/10.3390/polym11111842
Received: 21 October 2019 / Revised: 6 November 2019 / Accepted: 6 November 2019 / Published: 8 November 2019
(This article belongs to the Section Polymer Synthesis)
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, ɛ ~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. View Full-Text
Keywords: poly(dimethylsiloxane); hydrosilylation; functionalization; permittivity; transparency; elasticity poly(dimethylsiloxane); hydrosilylation; functionalization; permittivity; transparency; elasticity
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MDPI and ACS Style

Park, S.K.; Park, B.J.; Choi, M.J.; Kim, D.W.; Yoon, J.W.; Shin, E.J.; Yun, S.; Park, S. Facile Functionalization of Poly(Dimethylsiloxane) Elastomer by Varying Content of Hydridosilyl Groups in a Crosslinker. Polymers 2019, 11, 1842.

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  • Supplementary File 1:

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  • Externally hosted supplementary file 1
    Doi: 10.5281/zenodo.3514571
    Description: Figure S1. IR (a), 1H-NMR (b), 12C-NMR (c), and GPC spectra (d) of VPDMS. Figure S2. IR (a), 1H-NMR (b), 12C-NMR (c), and GPC spectra (d) of HPDMS10. Figure S3. IR (a), 1H-NMR (b), 12C-NMR (c), and GPC spectra (d) of HPDMS20. Figure S4. A photograph of the synthesized PDMS copolymers. Figure S5. IR spectrum of the dope layer prepared from HPDMS10 and TEGDE before and after curing at 80 ℃ for 2h. Figure S6. Isothermal TGA curves of TEGDE at different temperatures. Figure S7. IR spectra of the dope layers prepared from VH10 (a), VH10T (b), VH20T (c) before and after curing at 80 ℃ for 2 h.
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