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Preparation of molecularly well-defined silicone resins based on trifluoropropyl-substituted trisilanol and their thermal, mechanical, and UV-resistance properties

Polymer Journal volume 56, pages 481–489 (2024)Cite this article

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Abstract

We prepared flexible free-standing films of trifluoropropyl-substituted open-cage silsesquioxane-pendant polysiloxane by optimizing the sol-gel reaction conditions of tris(dimethoxysilyl-ethyl-dimethylsiloxy)-heptatrifluoropropyl-substituted open-cage silsesquioxane (1). The polycondensation of 1 was fully achieved even at 50 °C for 6 h under vacuo. 29Si CP-MAS NMR analysis indicated that the flexible free-standing films, polycondensed at 50 °C and 180 °C, included cyclotrisiloxane (D3) and linear siloxane (Dlinear) structures. The elastic modulus and decomposition temperature at 5% mass weight loss (Td5) of the product by polycondensation at 180 °C under N2 were significantly greater than those for the 50 °C product. Significant changes in the UV‒vis spectra of the resulting transparent films were not observed even after 13 days of UV irradiation in air. In contrast, UV irradiation of the isobutyl-substituted counterpart under air clearly caused a decrease in its transmittance due to autoxidative degradation.

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Acknowledgements

This work was supported by Grant-in-Aid for Scientific Research (No. 19H02764 and 23K17944) from the Ministry of Education, Culture, Sports, Science, and Technology, Government of Japan.

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Authors and Affiliations

  1. Faculty of Molecular Chemistry and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan

    Miku Kosaka, Taishi Nakano, Kenji Kanaori, Hiroaki Imoto & Kensuke Naka

  2. Materials Innovation Lab, Kyoto Institute of Technology, Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan

    Kensuke Naka

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Correspondence to Kensuke Naka.

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Kosaka, M., Nakano, T., Kanaori, K. et al. Preparation of molecularly well-defined silicone resins based on trifluoropropyl-substituted trisilanol and their thermal, mechanical, and UV-resistance properties. Polym J 56, 481–489 (2024). https://doi.org/10.1038/s41428-024-00886-w

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