用自制的扭摆仪研究了双链聚苯基倍半硅氧烷在-150°至450℃之间的动态力学性质,应用热处理和加增塑剂等方法对阻尼峰的本质进行了探索,初步认为-120℃的峰相当于硅-氧键单链的局部运动,-40℃的峰可能是双链硅氧烷的特征峰,到300℃时双链开始分解。 The dynamic mechanical properties of the double-chain polyphenylsilsesquioxane at -150 ° to 450 ° C were investigated by a self-made twist tester. The nature of the damping peak was explored by means of heat treatment and addition of plasticizer, It is considered that the peak at -120 ° C is equivalent to the local movement of the silicon-oxygen bond single strand, and the peak at -40 ° C may be the characteristic peak of the double-stranded siloxane, and the double strand begins to decompose at 300 ° C.