| 引用本文: | 毛仙鹤,宋永才,李伟.聚碳硅烷纤维化学气相交联研究.[J].国防科技大学学报,2006,28(1):17-22.[点击复制] |
| MAO Xianhe,SONG Yongcai,LI Wei.Study on Chemical Vapor Curing Method for Polycarbosilane Fiber[J].Journal of National University of Defense Technology,2006,28(1):17-22[点击复制] |
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| 聚碳硅烷纤维化学气相交联研究 |
| 毛仙鹤, 宋永才, 李伟 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 以环己烯作为反应气氛，对聚碳硅烷(PCS)纤维进行了化学气相交联不熔化处理。与空气不熔化进行对比，研究了不熔化过程中PCS纤维的反应程度及凝胶含量的变化，并进行了元素分析和热重差热分析，初步探讨了PCS纤维环己烯化学气相交联反应的机理。结果表明，在环己烯气氛中，PCS分子结构中Si-H键的反应程度随不熔化温度的提高逐渐增加，相应地，PCS纤维的凝胶含量迅速提高直至不熔。环己烯受热后产生自由基，引发PCS分子中的Si-H和Si-CH3键断裂形成自由基，促进PCS分子间形成Si-CH2-Si结构而实现交联。 |
| 关键词: 聚碳硅烷 环己烯 化学气相交联 碳化硅纤维 |
| DOI： |
| 投稿日期：2005-10-08 |
| 基金项目:国家部委资助项目；国防科技重点实验室基金资助项目 |
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| Study on Chemical Vapor Curing Method for Polycarbosilane Fiber |
| MAO Xianhe, SONG Yongcai, LI Wei |
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(College of Aerospace and Materials Engineering,National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Chemical vapor curing (CVC) method for polycarbosilane (PCS) fiber with unsaturated hydrocarbon vapor, cyclohexene, was studied and compared with air oxidation curing method. The analysis of composition and thermogravimetry of PCS fiber in the process of CVC was also characterized and an elementary reaction mechanism was discussed. The results show that Si-H bond in the molecular structure of PCS reacted during the cyclohexene curing process and the reaction degree increased with the rise of the curing temperature. Simultaneously, gel content of PCS fiber rapidly increased till PCS fiber became infusible. Si-H bond and Si-CH3 bond broke and formed free radicals through the agency of cyclohexene radical while being heated up, and then formed the structure of Si-CH2-Si, resulting in cross-linking between PCS molecules. |
| Keywords: polycarbosilane cyclohexene chemical vapor curing SiC fiber |
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