高透光聚有机硅氧烷的合成及结构性能研究

通过硅氧烷水解缩聚制备具有乙烯基和氢基的聚有机硅氧烷预聚物，预聚物在铂催化剂的作用下经硅氢加成固化为具有高度交联结构的聚有机硅氧烷树脂。利用核磁共振、红外光谱、凝胶色谱等方法研究预聚物和聚有机硅氧烷树脂的结构与性能。结果表明：预聚物中成功引入硅乙烯基、苯基及硅氢基，分子量约为1100g／mol，折光指数超过1．52；聚有机硅氧烷树脂具有高苯基含量和三维网状结构，透光率超过99％，在可见光区域基本无吸收，具备优异的光学性能。

Study on Preparation, Structure and Performance of Polysiloxane with High Transparency

Prepolymers containing C=C groups and Si-H groups are synthesized via co-hydrolysis/con- densation of siloxane, which are then cured to prepare densely crosslinked polysiloxane by hydrosilylation with a Pt catalyst, zgSi nuclear magnetic resonance（NMR） spectra, Fourier transform infrared spectrosco- py（FTIR） and Gel permeation chromatography（GPC） are used to characterize the structure and properties of prepolymers and polysiloxane. It indicates that the C=C groups, phenyl groups and Si-H groups are successfully introduced into the prepolymers, the molecular weight of which is ca. 1100 g/mol and the re- fractive indice of which are above 1.52. The polysiloxane possesses three-dimensional network structure and abundant phenyl groups. In addition, the polysiloxane exhibits high transmittance of about 99% and nearly no absorption in the visible range.