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通过聚合物交联前后动态力学性能和红外光谱的变化以及交联聚合物凝胶含量的测定,研究了聚碳硅烷热氧化及紫外光交联的特性和机理。结果表明在160℃的空气中,聚碳硅烷分子链间的Si通过O原子连接起来形成交联程度很高的不溶不熔结构;而在2537A的紫外光照射下,聚碳硅烷分子链间虽可形成一定的交联,但难于在体系中形成大量的交联程度很高的不溶不熔物。在聚碳硅烷分子链中适当引入-Si-Si-链段,可以提高聚合物的紫外光交联活性。
The properties and mechanism of thermal oxidation and UV crosslinking of polycarbosilane have been studied by dynamic mechanical properties and infrared spectroscopy before and after crosslinking and the determination of crosslinked polymer gel content. The results show that at 160 ℃ in the air, polycarbosilane molecular chain Si through the O atoms connected to form a high degree of cross-linked insoluble insoluble structure; and 2537A UV irradiation, polycarbosilane molecular chain though Can form a certain degree of cross-linking, but difficult to form in the system a large number of highly cross-linked insoluble infusible material. Appropriate introduction of -Si-Si- segments into the polycarbosilane molecular chain can increase the UV cross-linking activity of the polymer.