Abstract
Vinyl-methyl oligosiloxane resin was synthesized by a hydrolytic sol-gel reaction of vinyltriethoxysilane and dimethyldiethoxysilane. Hydrochloric acid was added as a catalyst to promote the hydrolysis of silane monomers to form a highly condensed siloxane resin (Condensation degree = 95 %). The vinyl-methyl oligosiloxane and hydrogen-methyl oligosiloxane resin was then cured by a thermal hydrosilylation reaction with a minimal platinum catalyst content (3 ppm). The increased cross-linking density improved the thermal decomposition temperature and lowered the weight loss at a high temperature. The fabricated methyl-siloxane hybrid material (hybrimer) shows superior thermal stability (decomposition temperature >530 °C), good long-term thermal resistance (300 °C, 20 h) and transparency (92 % at 450 nm, 83 % at 350 nm) in the visible and ultraviolet ranges. Based on these characteristics, the methyl-siloxane hybrimer can be applied to various applications, including thermally stable optical materials.
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Acknowledgments
This work was supported by Wearable Platform Materials Technology Center (WMC) funded by the National Research foundation of Korea (NRF) Grant of the Korea government (MSIP) (NRF-2016R1A5A1009926). This work was also supported by a grant from the Korea Evaluation Institute of Industrial Technology (Project number : 10051337). We are gratefully thank to the Korea Basic Science Institute (KBSI) for 29Si NMR spectra measurement.
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Bae, JY., Jang, J. & Bae, BS. Transparent, thermally stable methyl siloxane hybrid materials using sol-gel synthesized vinyl-methyl oligosiloxane resin. J Sol-Gel Sci Technol 82, 253–260 (2017). https://doi.org/10.1007/s10971-016-4262-2
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DOI: https://doi.org/10.1007/s10971-016-4262-2