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Journal of Sol-Gel Science and Technology
Published in: Journal of Sol-Gel Science and Technology 1/2017

06-03-2017 | Invited Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)

Transparent polyvinylsilsesquioxane aerogels: investigations on synthetic parameters and surface modification

Authors: Taiyo Shimizu, Kazuyoshi Kanamori, Kazuki Nakanishi

Published in: Journal of Sol-Gel Science and Technology | Issue 1/2017

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Abstract

Systematic investigations on the effect of synthetic conditions onto the properties of polyvinylsilsesquioxane (CH2=CHSiO3/2) aerogels have been conducted. As previously reported, transparent polyvinylsilsesquioxane aerogels can be obtained by utilizing a liquid surfactant as a solvent and a two-step sol–gel reaction involving hydrolysis catalyzed by a strong acid and subsequent polycondensation by a strong base. In this study, effects of base catalyst, gelation and aging conditions, amount of surfactant and concentration of acid catalyst have been investigated. With the optimized synthetic condition, the value of light transmittance reaches as high as 70% (at the wavelength of 550 nm for a 10-mm thick sample). Applicability of addition reactions utilizing thiol-ene reactions and hydrosilylation has also been surveyed. Thiol-ene reactions are relatively effective and can modify surface hydrophobicity and mechanical properties of polyvinylsilsesquioxane aerogels. In the case of hydrosilylation, a partial addition of a hydrosilane compound onto the polyvinylsilsesquioxane gel surface can be observed. Addition reactions, in particular thiol-ene reactions, are found to be profitable for implementing chemical functionality on the transparent aerogels.

Graphical Abstract

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Appendix
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Metadata
Title
Transparent polyvinylsilsesquioxane aerogels: investigations on synthetic parameters and surface modification
Authors
Taiyo Shimizu
Kazuyoshi Kanamori
Kazuki Nakanishi
Publication date
06-03-2017
Publisher
Springer US
Published in
Journal of Sol-Gel Science and Technology / Issue 1/2017
Print ISSN: 0928-0707
Electronic ISSN: 1573-4846
DOI
https://doi.org/10.1007/s10971-017-4339-6

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