预氧化过程中PAN纤维皮芯结构的变化  

The evolution of the core/shell structure of polyacrylonitrile fibers during preoxidation

作　　者：刘杰[1] 李佳[1] 王雷[1] 马兆昆[1] 梁节英[1] 

机构地区：[1]北京化工大学新型高分子材料的制备与加工北京市重点实验室,北京100029

出　　处：《新型炭材料》2008年第2期177-184,共8页New Carbon Materials

基　　金：973计划(2006CB605304);国家"十一五"863计划(2006AA06Z382);国家重点自然科学基金(50333070);国家自然科学基金(50673011)~~

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。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.

关 键 词：炭纤维 聚丙烯腈(PAN) 预氧化 皮芯结构 

分 类 号：TQ340.1[化学工程—化纤工业]