聚碳硅烷纤维的不熔化处理研究(III)--不熔化机理的探讨

对PCS纤维空气氧化反应过程中产生的尾气进行了色谱分析 ,并对氧化后的纤维进行了红外分析 ,在此基础上推测了不熔化机理 ;采用XPS分析技术考察了氧在PCS纤维中的分布。结果表明 ,PCS纤维氧化反应过程中有少量氢气生成 ,出现局部过热时伴随有CO2 生成 ;氧在不熔化PCS纤维中由表及里呈梯度分布 ,低温、长时的不熔化处理条件有利于氧在纤维中的扩散和均匀分布

Study on Curing of Polycarbosilane Fibers (III)- Air-Curing Mechanism

In order to investigate the air oxidation mechanism of PCS fibers , the tail gases during air oxidation of PCS fibers were analyzed by GC, and the oxidized PCS fibers were analyzed by IR. The distribution of oxygen in cured PCS fibers was studied by XPS method . It was showed that a small quantity of hydrogen was formed, and some carbon dioxide was produced in local over temperature area during air curing process of PCS fibers. Oxygen content in cured PCS fibers was gradient from surface to interior.Low curing temperature and long curing time would result in full diffusing and well distribution of oxygen in cured PCS fibers.