超支化聚碳硅烷的掺硼改性与陶瓷化研究  

Modification of a hyperbranched polycarbosilane with boron and its polymer-to-ceramic conversion

作　　者：张佩[1,2] 杨乐[2] 徐敏珊[2] 闵浩[2] 余兆菊[2] 

机构地区：[1]厦门大学化学化工学院,福建厦门361005 [2]厦门大学材料学院高性能陶瓷纤维教育部重点实验室,福建厦门361005

出　　处：《功能材料》2014年第4期35-38,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50802079);福建省自然科学基金资助项目(2011J01330)

摘　　要：通过二甲基胺硼烷(DMAB)与烯丙基超支化聚碳硅烷(AHPCS)反应合成含硼聚碳硅烷先驱体,后经170℃热交联及高温裂解制备出碳化硅陶瓷。采用傅立叶红外光谱、热重分析、X射线衍射分析及扫描电子显微镜对上述过程进行研究。结果表明,DMAB中的B—H键可分别与AHPCS中的CC键及Si—H键发生硼氢化反应和脱氢偶合反应,从而促进AHPCS的热交联,并显著提高陶瓷产率。此外,硼的引入还可有效抑制β-SiC在高温下的结晶。A boron-modified AHPCS was prepared by chemical reactions between allylhydridopolycarbosilane （AHPCS） with dimethylamine borane （DMAB）, and then cross-linking at 170 ℃, followed by pyrolyzing at high temperatures to afford SiC-based ceramics. The cross-linking and polymer-to-ceramic conversion of the bo- ron-modified AHPCS were characterized by FT-IR, TGA, XRD and SEM. The results indicate that the cross- linking of AHPCS was improved, involving hydroboration reaction between vinyl groups of AHPCS and B H groups of DMAB, and dehydrocoupling reaction between Si H groups of AHPCS and B--H groups of DMAB. As a result, the ceramic yield of the B-modified AHPCS was significantly enhanced. Moreover, the introduction of boron inhibits the crystallization of β-SiC at high temperatures obviously.

关 键 词：二甲基胺硼烷 烯丙基超支化聚碳硅烷 先驱体 陶瓷化 

分 类 号：TQ174.4[化学工程—陶瓷工业] TB324[化学工程—硅酸盐工业]