预氧结构对聚丙烯腈基碳纤维致密结构的影响  

The relationship between the structures of polyacrylonitrile carbon fibers and the stabilized fiber precursors

作　　者：赵震[1] 张琨[1] 史晓健[1] 徐樑华[1] 

机构地区：[1]北京化工大学材料科学与工程学院国家碳纤维工程技术研究中心,北京100029

出　　处：《北京化工大学学报（自然科学版）》2013年第2期44-48,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家"973"计划(2011CB605602)

摘　　要：利用TG,Raman,EA,XRD,NMR等分析手段,研究了预氧纤维在碳化过程中的结构转变。研究结果表明:碳纤维体密度随预氧纤维体密度的升高呈下降趋势;预氧纤维中的含氧量会影响碳纤维的致密结构,氧元素的脱除影响碳纤维非晶区结构的交缠程度进而影响碳纤维体密度,碳纤维体密度随预氧纤维的含氧量增加而降低。通过碳纤维致密结构与预氧纤维结构的相关性分析,初步建立了两者之间的关联关系。In the carbonization of polyacrylonitrile （PAN） fibers, the stabilized structure evolves into the compact structure of PAN-based carbonized fibers by pyrolysis ＇and rearrangement. The compact structure of the carbon fiber is one of the factors affecting its performance. TG analysis, Raman spectroscopy, NMR spectroscopy, elemental a- nalysis and other methods have been used to explore the evolution of the stabilized structure during the carbonization process. The results show that the bulk density of the carbon fiber decreases with increasing bulk density of the sta- bilized fiber. Further studies reveal that the structure of the oxygen-containing material has an effect on the compact structure of the carbon fiber. The removal of oxygen has an effect on the degree of entanglement in the non-crystal- line structure and thus affects the bulk density of the carbon fiber. The bulk density of the carbon fiber decreases with increasing oxygen content of the stabilization fiber. Preliminary details of the relationship between the compact structure of the stabilized structure and that of the carbon fiber have thus been established.

关 键 词：致密结构 体密度 预氧结构 预氧化 

分 类 号：TQ342.31[化学工程—化纤工业]