中文摘要：

以二氯甲基硅烷和间二乙炔基苯为原料，通过有机镁格氏试剂与卤代硅烷的缩合反应，合成得到了一种新结构的聚（间乙炔基一甲基氢苯基硅烷）树脂（PCS）。采用FT—IR、^1H—NMR、^13C—NMR和GPC对树脂的结构进行了表征，采用DSC和TGA对树脂的固化反应和热稳定性能进行了研究。结果表明：PCS树脂在160℃及240℃处有固化反应放热峰；其固化产物具有优异的耐热及耐热氧化性能，在氮气与空气氛围下质量损失5％的温度（Td5）分别为644、595℃，而1000℃的质量保留率分别为89．0％、57．9％。

英文摘要：

A high temperature-resistant organic-inorganic hybrid resin, poly （m-dietheynylbenzene-methyl- silane） （PCS）, was synthesized from dichloromethylsilane and diethynylbenzene using Grignard reagent method. The structure of PCS was characterized by FT-IR,^1H-NMR, ^13C-NMR and GPC. The curing behavior of PCS resin was studied by DSC and thermal stability of the cured resin was analyzed by TGA. Results showed that there were two exothermic peaks at 160 ℃ and 240℃ in DSC curve of PCS resin. The cured PCS resins had excellent thermo-oxidative stability. Under nitrogen and air condition, the tempe- rature of 5% mass loss（Tds） and the residual of mass at 1 000 ℃ were up to 644 ℃and 89.0%, 595 ℃ and 57.9% , respectively.