PAN纤维预氧结构高温演变及其对热稳定性的影响  

Structural transformation of polyacrylonitrile fiber and the effect on thermal stability

作　　者：张琨[1] 赵震[1] 肖阳[1] 张校[1] 徐樑华[1] 

机构地区：[1]碳纤维及功能高分子教育部重点实验室,北京化工大学材料科学与工程学院,北京100029

出　　处：《化工新型材料》2014年第8期70-72,共3页New Chemical Materials

基　　金：国家科技部973项目(2011CB605602)

摘　　要：在惰性气氛条件下，将PAN预氧纤维在280～380℃进行热处理，通过固体核磁、元素分析、激光拉曼光谱、X射线光电子能谱及热重分析等方法研究了PAN预氧纤维在高温热处理过程中的结构演变及其对热稳定性的影响规律。结果表明：热处理过程中，PAN纤维内部发生了分子内环化、分子间环化、环结构及氧结构的重排等反应，随着热处理温度升高，环化程度加深，含氧结构减少；热稳定性研究表明，经过340℃处理的纤维结构规整度高，热稳定性较好。Preoxidized polyacrylonitrile （PAN） fibers was heated by isothermal treatment from 280 to 380℃ in inert atmosphere. Through using the test means of^13C solid nuclear magnetic resonance, demental analysis, rarnan spectral analysis, X-ray photoelectron spectroscopy and thermo-gravimetric analysis, the structural transformation of the fiber and its effect on thermal stability were investigated. The results indicated that,in the process of heat treatment,intramolecular cyclization reaction,intermolecular cyclization reaction,the rearrangement of cyclic structure and oxygenic structure have taken place. Along with the increasing of processing temperature,the degree of cyclization deepened and the oxygenic structure reduced. The research of thermal stability showed that the fiber treated at 340 ℃ had a high regularity and good thermal stability.

关 键 词：聚丙烯腈纤维 环化结构 含氧结构 热稳定性 

分 类 号：TQ342.3[化学工程—化纤工业]