摘要
以异丙醇锆(ZIP)为交联剂、聚碳硅烷(PCS)为先驱体,在Ar气氛的保护下通过干法纺丝、热化学交联工艺使PCS从热塑性转变热固性结构。研究了该工艺对PCS纤维质量变化、Si-H反应程度、溶解性及氧含量等性能的影响。实验结果表明:在不熔化过程中,PCS结构中的Si-H键与ZIP反应,在PCS分子间形成Si-O-Zr交联结构,随着交联温度和保温时间的升高,Si-H反应程度和纤维失重率相应提高;在测试范围内最大Si-H反应程度为73.06%,失重率2.678%,氧含量低于2.0%。
Polycarbosilane from dry spinning to SiC fiber through thermochemical curing,which is catalysed by zirconium iso-propoxide(ZIP) under Ar gas stream,is transformed from thermoplastic to thermoset structure.The effects of curing temperature and holding time on cured PCS fibers are mainly studied in this paper.The experimental result shows that Si-H bonds in polycarbosilane are crosslinked by ZIP during the curing process which is made up of Si-O-Zr structure in PCS molecule.And the reaction degree of Si-H bonds and mass loss of fibers are increased accordingly with the temperature and holding time rising.The maxium reaction degree of Si-H bonds is 73.06%,mass loss 2.678%,and oxygen content no more than 2.0 %,respectively.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2006年第z1期317-320,325,共5页
Journal of Materials Engineering
基金
总装备部预研基金资助(51412020404QT870)
关键词
聚碳硅烷
异丙醇锆
热化学交联
polycarbosilane
zirconium iso-propoxide
thermochemical crosslinking
