【摘要】 借助红外测试(FT-IR)、元素分析(EA)、扫描量热分析(DSC)和扫描电子显微镜(SEM)系统研究了五种聚丙烯腈(PAN)纤维在预氧化过程中纤维皮芯结构的变化、差异、规律及其与热化学反应、结构变化的关联。结果表明:预氧化过程中PAN纤维皮芯比的变化与纤维组成、结构和致密性等化学与物理性质密切相关。在一定预氧化条件下,皮芯比的变化与纤维热化学反应特性的差异、直径收缩率和密度的变化存在良好的对应关系。最终预氧化纤维的皮芯比与炭纤维的力学性能密切相关。更多还原

【Abstract】 The core/shell structure of polyacrylonitrile (PAN) fibers formed during preoxidation was investigated by DSC, FT-IR, SEM, optical microscopy and density measurement. Five precursors were used to correlate the core/shell structure with their thermo-chemical reactivity. It was found that the morphologies of the core/shell structures are highly relevant to the reactivity, microstructure and density of PAN fibers, and the quality of the resultant carbon fibers depends strongly on the degree of pre-oxidation.更多还原