Synthesis and Properties of Poly(m-dietheynylbenzenemethylsilane) Resin

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 °C and 240 °C 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(Td5) and the residual of mass at 1 000 °C were up to 644 °C and 89.0%, 595 °C and 57.9% , respectively.