“软-硬”段结构聚硅氧烷的制备及其性能研究

Study on preparation and properties of “soft-hard segment” polysiloxane

以苯基三甲氧基硅烷为原料,在盐酸催化下,通过水解缩聚反应,制备了苯基硅树脂预聚体。以二丁基二月桂酸锡为催化剂,以苯基硅树脂预聚体与羟基硅油为原料,制备了具有"软-硬"段结构聚硅氧烷。通过核磁共振、红外光谱对产物进行了结构表征,通过差示扫描量热仪进行了耐热性能的研究。结果表明,制备苯基硅树脂预聚体最佳的水与甲氧基物质的量比为1∶2,盐酸最佳质量分数为6%。热重分析表明,所制备的"软-硬"段结构聚硅氧烷具有良好的耐热性,800℃时质量失重率仅为25%。

The phenyl silicon resin prepolymer was prepared by hydrolysis and polycondensation of phenyltrimethoxylsilane in the presence of hydrochloric acid as the catalyst.The ＂soft-hard segment＂ polysiloxane was prepared by condensation reaction of the phenyl silicon resin prepolymer with hydroxyl-terminated silicon oil in the presence of dibutyl tin dilaurate catalyst. The chemical structure of the product was characterized by IR and ^1H-NMR and its heat resistance was investigated by DSC.The optimum reaction conditions of synthetic phenyl silicon resin prepolymer are that the molar ratio of water to methoxyl groups is 1：2 and the amount of hydrochloric acid is 6% by weight. The TGA result of the ＂soft-hard segment＂ polysiloxane shows that it has good heat-resistant properties and its lost weight only is 25% at 800℃.