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Effects of 3D structure of silsesquioxane moieties on the thermal and optical properties of transparent epoxy/silsesquioxane hybrid materials

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Abstract

Transparent and colorless epoxy/silsesquioxane (SQ) hybrids were prepared by modifying bisphenol-A epoxy resin with two SQ type epoxy resins having different 3D structures, that is, double-decker SQ and cage SQ type epoxy resins. To compare these two hybrids, the cured resin modified with the imperfect ladder SQ epoxy resin was also prepared. The effects of the 3D-structure of the SQ moieties on the thermomechanical, optical and dielectric properties of the cured epoxy/SQ hybrids were investigated. Thus, the refractive index and dielectric constant of the hybrids significantly decreased with an increase in the contents of the SQ moieties. This is due to the introduction of Si atoms with a low atomic polarity and large intermolecular space that was estimated from the difference between the volume of the space surrounded by “Connolly surface” and the van der Waals volume of the SQ moieties. The glass transition temperature, T g, also decreased with the introduction of the SQ moieties, due to the increase in the intermolecular space. Thus, it was concluded that the performance of the epoxy/SQ hybrids depends not only on the SiO3/2 content, but also on the 3D structure of the SQ moieties.

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Acknowledgements

The cage and double-decker SQ epoxy resins were kindly supplied from JNC Petrochemical Co. and the imperfect ladder SQ resin from NIPPON KAYAKU Co. Ltd. The author would like to express our sincere thanks for their kindness. In addition, the author would like to thank the MEXT for financial support to a part of this study by the Grants-in-Aid for Scientific Research.

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Authors and Affiliations

  1. Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35, Suita-shi, Osaka, 564-8680, Japan

    Mitsukazu Ochi, Yasuhiro Uno & Miyuki Harada

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  1. Mitsukazu Ochi
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  2. Yasuhiro Uno
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  3. Miyuki Harada
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Correspondence to Mitsukazu Ochi.

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Ochi, M., Uno, Y. & Harada, M. Effects of 3D structure of silsesquioxane moieties on the thermal and optical properties of transparent epoxy/silsesquioxane hybrid materials. J Mater Sci 48, 7245–7252 (2013). https://doi.org/10.1007/s10853-013-7543-y

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  • DOI: https://doi.org/10.1007/s10853-013-7543-y

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