【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
【机 构】
：
国防科技大学航天与材料工程学院,国防科技大学航天与材料工程学院,国防科技大学航天与材料工程学院,国防科技大学航天与材料工程学院 长沙410073,长沙410073,长沙410073,长沙410073
论文部分内容阅读
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 polycarbosilane (PCS) crude product obtained by the reaction of liquid polysilane (LPS) at 450 ℃ was dissolved, filtered, heat-treated and then distilled under reduced pressure. The distilled fractions were collected and characterized to derive PCS with different molar masses The mechanism of conversion of LPS to PCS is deduced that the Si-Si bonds in LPS are broken, rearranged and converted into Si-C bonds with the increase of temperature, The temperature continues to rise, carbosilane dehydrogenation occurred between molecules, demethanization condensation reaction, the molar mass gradually grew to generate PCS.
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