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Polymerization behavior and gel properties of ethane, ethylene and acetylene-bridged polysilsesquioxanes

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Abstract

Soluble bridged polysilsesquioxanes with a range of molecular weight were synthesized from bis(triethoxysilyl)ethane, ethylene, and acetylene (BTES-E1, -E2, and -E3) via hydrolysis and polycondensation reaction by adjusting the water amount. Polymerization behavior of these three trialkoxysilanes was investigated by monitoring the reaction progress by GPC, and 29Si NMR spectrometry of the resulting polymers, poly(BTES-E1), poly(BTES-E2), and poly(BTES-E3), showing that BTES-E1 generated cyclic oligomers at the early stage. In contrast, polymerization of BTES-E2 and BTES-E3 provided no detectable amounts of cyclic oligomers, but afforded linear polymers only. Bulk gels were also prepared by curing the polymers. The gel from poly(BTES-E3) exhibited high thermal stability derived from the rigid acetylene spacer with respect to thermogravimetric analysis. On the other hand, the polymer film of BTES-E1 showed the highest pencil hardness index among the polymers, indicating the tight siloxane network of poly(BTES-E1).

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Acknowledgments

This research was supported by Core Research for Evolutionary Science and Technology (CREST), Japan Science and Technology Agency (JST).

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Authors and Affiliations

  1. Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan

    Kazuki Yamamoto, Joji Ohshita & Tomonobu Mizumo

  2. Department of Chemical Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, Japan

    Toshinori Tsuru

Authors
  1. Kazuki Yamamoto
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  2. Joji Ohshita
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  3. Tomonobu Mizumo
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  4. Toshinori Tsuru
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Correspondence to Joji Ohshita.

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Yamamoto, K., Ohshita, J., Mizumo, T. et al. Polymerization behavior and gel properties of ethane, ethylene and acetylene-bridged polysilsesquioxanes. J Sol-Gel Sci Technol 71, 24–30 (2014). https://doi.org/10.1007/s10971-014-3322-8

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  • DOI: https://doi.org/10.1007/s10971-014-3322-8

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