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Thermoplastic and thermosetting properties of polyphenylsilsesquioxane particles prepared by two-step acid-base catalyzed sol-gel process

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Abstract

Polyphenylsilsesquioxane (PhSiO3/2) particles were synthesized by a two-step acid-base catalyzed sol-gel process, in which phenyltriethoxysilane used as a starting alkoxide was hydrolyzed and condensed in the first step under two different acid-catalyzed conditions. The PhSiO3/2 particles prepared under an acid-catalyzed process without using a solvent were thermally hardened after the first heating up to 200°C. In contrast, the PhSiO3/2 particles prepared under an acid-catalyzed process with ethanol as a solvent were thermally softened with the repeated heating processes up to 200°C. From the gel permeation chromatography measurements, it was found that the average molecular weight of the particles prepared with the use of ethanol was decreased in comparison with that of the particles prepared without using ethanol. The addition of ethanol in the sols during hydrolysis and condensation reaction under the acid-catalyzed process caused the decrease in the average molecular weight, which should result in the changes of thermal property of PhSiO3/2 particles from thermosetting to thermoplastic.

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Acknowledgments

This work was partially supported by a Grant-in-aid from the Ministry of Education, Culture, Sports, Science and Technology of Japan. A. M. acknowledges New Energy and Industrial Technology Development Organization for the support by the project “Development of Technology for Next-Generation Fuel Cells” in the programs of Strategic Development of PEFC Technologies for Practical Application.

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Authors and Affiliations

  1. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    Kenji Takahashi, Kiyoharu Tadanaga, Akitoshi Hayashi & Masahiro Tatsumisago

  2. Department of Materials Science, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi, 441-8580, Japan

    Atsunori Matsuda

Authors
  1. Kenji Takahashi
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  2. Kiyoharu Tadanaga
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  3. Atsunori Matsuda
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  4. Akitoshi Hayashi
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  5. Masahiro Tatsumisago
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Correspondence to Kenji Takahashi.

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Takahashi, K., Tadanaga, K., Matsuda, A. et al. Thermoplastic and thermosetting properties of polyphenylsilsesquioxane particles prepared by two-step acid-base catalyzed sol-gel process. J Sol-Gel Sci Technol 41, 217–222 (2007). https://doi.org/10.1007/s10971-006-1501-y

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  • DOI: https://doi.org/10.1007/s10971-006-1501-y

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