热氧稳定化过程中聚丙烯腈纤维序态结构的变化  

The morphological structure of polyacrylonitrile fiber during thermal-oxidation stabilization process

作　　者：刘杰[1] 阳武[1] 

机构地区：[1]北京化工大学炭纤维及复合材料研究所,北京100029

出　　处：《材料研究学报》2007年第5期487-490,共4页Chinese Journal of Materials Research

基　　金：国家重点基础研究发展计划(973)2006CB605304;国家高技术研究发展计划(863)2006AA06Z382;国家重点自然科学基金50333070;国家自然科学基金50673011资助项目.

摘　　要：研究了聚丙烯腈(PAN)共聚纤维在连续热氧稳定化过程中序态结构的变化,结果表明:X射线衍射极图所提供的0°-360°全角扫描信息,可表征纤维内部晶面法向分子链的分布密度,描述分子链取向结构的变化程度;可较全面、动态和直观地解析聚丙烯腈大分子链在热氧稳定化过程中经历的由初期取向结构改善到中、后期大分子链解取向的全过程.在较低的热氧稳定化温度下,PAN大分子链无序区先发生化学反应,有序度变化不大;当热处理提供的能量超过有序区环化和改变分子构象所需要的能量时,有序区发生剧烈的热化学反应,有序度急剧下降.The morphological structure of PAN copolymer fiber during its thermal oxidative stabilization was characterized and investigated by X-ray diffraction （XRD） and differential scanning calorimetry （DSC） in this paper. Results show that the all-round scanning information offered by X-ray diffraction pole characterized persuasively the changing process of orientation structure during the thermal oxidative stabilization is that the PAN molecular chains verified from the initial improvement to the consequent disorientation. The chemical reaction is occurred in amorphous region at lower thermal oxidative temperature, and then expanded to crystalline region and resulted in the descend of crystallinity when the energy provided by heat treatment temperature exceeded the energy which to change the molecular conformation in cyclization reaction.

关 键 词：有机高分子材料 聚丙烯腈(PAN) 炭纤维热氧稳定化 序态结构 

分 类 号：TB324[一般工业技术—材料科学与工程]