聚碳硅烷的高温高压生成机理研究II蒸馏产物的结构分析  

Reaction mechanism of polycarbosilane at high temperature under high pressure(II):structure analysis of distillation products

作　　者：程祥珍[1] 谢征芳[1] 宋永才[1] 肖加余[1] 

机构地区：[1]国防科技大学航天与材料工程学院,长沙410073

出　　处：《有机硅材料》2007年第1期18-22,共5页Silicone Material

基　　金：湖南省自然科学基金项目(03JJY3070);国防科技重点实验室基金资助项目(2004JS514880101KG013)

摘　　要：以液态聚硅烷(LPS)在450℃反应得到的聚碳硅烷(PCS)粗产品为原料,经溶解、过滤、热处理后减压蒸馏,收集蒸馏馏分并进行表征,由此推出不同摩尔质量的PCS的典型结构,进而推测出LPS转化为PCS分子的机理是:随着温度的升高,LPS中的Si—Si键发生断裂、重排,转化为Si—C键,生成低分子碳硅烷;随着温度的继续升高,碳硅烷分子间发生脱氢、脱甲烷缩合反应,摩尔质量逐渐长大,生成PCS。The coarse polycarbosilane (PCS) was synthesized at 450℃ under the high pressure with liquid polysilane (LPS).The reaction mechanism of PCS was conferred from the characteristics of typical PCS structures with different molecular weight obtained by atmospheric distillation at different temperatures.The results showed that during the synthesis ,Si-Si bonds of LPS were converted to Si-C bonds as the reaction temperature increased,and the low molecular carbosilane was first formed.As the reaction temperature further increased,the small carbosilane molecules were combined through dehydrogenation and dehydrocarbonation condensation reaction ;PCS was thus obtained .

关 键 词：聚碳硅烷 高压 聚硅烷 碳化硅 

分 类 号：O634.41[理学—高分子化学]