聚硅芳撑硅氧烷的研究(Ⅱ)——聚四甲基对硅苯撑硅氧烷的合成

Studies on Polysilyl-Arylene Siloxane(Ⅱ)——Synthesis of Poly(tetramethyl-p-silphenyiene Siioxane)

本文以具有硅苯撑结构的环状有机硅氧烷——十二甲基环三对硅笨撑硅氧烷为单体,用开环聚合方法合成了聚四甲基对硅苯撑硅氧烷.选用硅醇钾催化,环单体有较高的开环聚合活性.通过IR、~1H NMR和^(13)C NMR等证明了聚合物的化学结构.聚合物在空气中的热失重温度较聚二甲基硅氧烷约高110℃,因此热稳定性更好.

Poly(tetramethyl-p-silphenylene siloxane) (PMSPS) with Mw of 6.6×105 was synthesized by the ring-opening polymerization of dodecametliyl-cyeio-p-silphenylene trisiloxane (MSPTS) at 160℃ with potassium silanolate (0.01%)as the catalyst.The relationship between conversion of monomer or Mw of PMSPS and polymerization time indicates that under the mentioned polymerization condition,the MSPTS is active enough to polymerize and the ring-opening polymerization ss basically completed within half an hour.In addition,some properties of PMSPS,characterized by GPC,FTIR,1H NMR,13C NMR and TGA are also reported.The TGA result shows that PMSPS has a much higher thermal stability than that of polydimethylsiloxane mrtety