聚丙烯腈纤维预氧化过程中微观结构的演变-材料工程.PDF

61 Microstructure Evolution of Polyacrylonitrile Fibers During Preoxidation 1 1 2 3 3 1 , , , , , ( 1 , 136000; 2 , 1 0001; 3 , 030001) 1 1 2 3 H UA Zhong , YAN G Yu-rong , YUAN Yuan , YANG Yong-gang , 3 1 CAO Xia , WANG Zh-i ying ( 1 Institute of Condensed M atter Physics, Jilin Normal U niversity, Siping 136000, Jilin, China; 2 Institute of Information and Fuctional Materials, Harbin Institute of Technology , Harbin 1 0001, China; 3 Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China) : ( SEM) X ( WAXD) X ( SAXS) 200~ 27 e WAXD, SAXS , , : , , , , : ; ; ; ; + : T Q342 .742 : A : 1001-4381(2009) 09-0061-0 Abstract: T he cross-section character and microstructure of polyacrylonitrile fibers w hich w ere preox- ided gradually at 200-27 e w ere investigated by means of scanning electron microscope( SEM) , w ide angle X-ray diffraction ( WA XD) , small angle X-ray scattering ( SAXS) . Based on the WAXD and SAXS data of different specimen , the crystallite size , micropore size, volume fraction of small micro- pore and micropore fractal dimension w ere calculated respectiv