电子束辐照对聚碳硅烷结构与热解性能的影响  

Chemical structures and pyrolysis properties of polycarbosilane irradiated by electron beam

作　　者：肖建建 李婧[2] 付真金[2] 韦建军[1] 李波[2] 

机构地区：[1]四川大学原子与分子物理研究所,成都610065 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2014年第12期109-114,共6页High Power Laser and Particle Beams

基　　金：中国工程物理研究院科学技术发展基金项目(2013B0302053)

摘　　要：在惰性气氛下,用电子束对聚碳硅烷(PCS)进行辐照改性。利用傅里叶变换红外光谱分析、凝胶含量测定以及热重-气相色谱-质谱连用技术对不同剂量改性的PCS进行了分析表征,研究了辐照剂量对PCS结构与热解性能的影响。结果表明,电子束辐照作用使PCS样品中大量Si—H键和C—H键发生断裂,形成了以Si—C—Si为骨架的三维网状凝胶产物,当辐照剂量高于3MGy时,PCS的凝胶化程度随辐照剂量的增加而明显变大。热重分析表明,电子束辐照有利于提高PCS的热稳定性,其初始失重温度和陶瓷化产率都会随辐照剂量的增加而升高,其中,经20 MGy辐照后的PCS样品的陶瓷化产率可达87%。此外,对于400℃预处理的PCS样品,在相同吸收剂量下,样品的凝胶质量分数、初始失重温度和最终陶瓷化产率都较未处理的高。Polycarbosilane （PCS） was irradiated by electron beam （EB） with inert gas protection. The as-prepared speci- mens were characterized using IN, Gel content measurements and TG-GC-MS. The chemical structures, the pyrolysis properties and the effects of irradiation dose were investigated. The result shows that three-dimensional netlike gel products composed as Si C Si crosslinking bonds were formed in the irradiated products, and that Si H bonds and C H bonds were partly broken down in the process of irradiation. The gel content of PCS increased evidently with the irradiation dose, especially when the ab- sorbed dose was above 3MGy. Furthermore, the thermo-stability and ceramic yield could be improved by EB radiation and the ce- ramic yield of PCS irradiated under 20 MGy could be up to 87%. In addition, the gel content, the pyrolysis temperature and the ceramic yield of pre-heatment at 400 could be higher than the PCS raw material at the same absorbed dose.

关 键 词：电子束辐照 聚碳硅烷 吸收剂量 化学结构 热解性能 

分 类 号：TB324[一般工业技术—材料科学与工程] TQ174[化学工程—陶瓷工业]