聚丙烯腈
材料科学
极限抗拉强度
碳化
傅里叶变换红外光谱
拉曼光谱
延伸率
复合材料
纤维
结晶度
分子间力
化学工程
聚合物
化学
分子
有机化学
光学
物理
工程类
扫描电子显微镜
作者
Sungho Lee,Jihoon Kim,Bon‐Cheol Ku,Junkyung Kim,Han‐Ik Joh
出处
期刊:Advances in Chemical Engineering and Science
[Scientific Research Publishing, Inc.]
日期:2012-01-01
卷期号:02 (02): 275-282
被引量:208
标识
DOI:10.4236/aces.2012.22032
摘要
The effect of structural evolution polyacrylonitrile (PAN) on mechanical properties was investigated in stabilization and carbonization. PAN spun fibers were stabilized in a convection oven with a constant tension for various times at 250℃. Fourier Transform Infrared spectroscopy (FTIR) and gel fraction results suggested that intra and intermolecular stabilization reactions occurred simultaneously. X-ray diffractograms revealed a disruption of crystalline structure and an appearance of pre-graphitic structure of PAN fibers due to stabilization. These structural changes by stabilization resulted in the significant decrease of tensile properties of fibers. In Raman spectra with heat treated fibers from 400℃ up to 1200℃, the intensity ratio of the D to G bands (ID/IG) decreased as heat treatment temperature increased, indicating an increase of basal plane of graphitic layer of heat treated fibers. Tensile strength of heat treated fibers at 1200℃ was found to be as high as 2.2 GPa.
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