Synthesis of Transparent Densely Crosslinked Polysiloxane with High Refractive Index |
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| Authors: | Jin Wang Ming-Liang Du Cong-Sheng Xu Han Zhu Ya-Qin Fu |
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| Institution: | 1. Faculty of Materials and Textiles , Zhejiang Sci-Tech University , Hangzhou , China;2. Faculty of Materials and Textiles , Zhejiang Sci-Tech University , Hangzhou , China;3. Key Laboratory of Advanced Textile Materials and Manufacturing Technology , Ministry of Education , Hangzhou , China |
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| Abstract: | Densely crosslinked polysiloxane, with high refractive index and high transparency, was synthesized via co-hydrolysis/condensation and then cured via hydrosilylation with a Pt catalyst. 29Si nuclear magnetic resonance (NMR) spectra were utilized to identify the process of co-hydrolysis/condensation and characterize the structures of the prepolymers. Fourier transform infrared spectroscopy (FTIR) was used to investigate the hydrosilylation reaction. The number-average molecular weight of the prepolymers was determined to be ca. 1200 g mol?1. Prepolymers with high refractive index, above 1.52, were synthesized, from which densely crosslinked polysiloxane resins, with high transmittance of about 99% and nearly no absorption in the visible range, were prepared. |
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| Keywords: | condensation high refractive index hydrolysis hydrosilylation polysiloxane transparency |
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