摘要
采用60 Co产生的γ射线与10MeV电子加速器产生的电子束在空气中辐照聚碳硅烷先驱丝。利用凝胶含量测定、红外光谱分析、凝胶渗透色谱分析、热重分析等手段研究了经两种辐照场辐照后聚碳硅烷先驱丝的凝胶含量、化学结构、分子量分布及其热分解特性的变化。结果表明:两种辐照场下能满足聚碳硅烷先驱丝不熔化处理的剂量分别为3、6.5MGy,两种辐照场下聚碳硅烷先驱丝的辐照不熔化机理一致,均通过形成Si—C—Si、Si—O—Si桥联结构而实现不熔化处理;在相同吸收剂量下,γ射线辐照不熔化效果较电子束辐照的好;γ射线辐照的聚碳硅烷先驱丝陶瓷产率也较电子束辐照的高。
Polycarbosilane fibers were irradiated by γray or 10 MeV electron beam in air. Gel content, chemical structure, molecular weight distribution and pyrolysis properties were studied. The curing dose of polycarbosilane fibers irradiated by γ ray or electron beam is 3 MGy and 6.5 MGy, respectively. Bridge structures of Si--O--Si and Si--C--Si are formed in the irradiated products. Radiation curing mechanism of polycar- bosilane fibers are uniform under two kinds of irradiation fields. The effect of radiation curing irradiated by γ ray is better than that of electron beam irradiation at the same absorbed dose, and the ceramic yields irradiated by γ ray are also higher.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2012年第1期10-14,共5页
Atomic Energy Science and Technology
基金
中国工程物理研究院科学技术基金重大资助项目(2004Z0502)
关键词
聚碳硅烷
Γ射线
电子束
polycarbosilane
γ ray
electron beam
