拉曼光谱法研究聚丙烯腈基碳纤维石墨结构取向

利用拉曼光谱对不同取向度的聚丙烯腈（PAN)基碳纤维进行截面和表面区域石墨结构表征，通过对测试机理的分析以及取向与模量相关性的研究，建立了采用拉曼光谱表征纤维皮部石墨结构取向的方法。研究发现，拉曼表征的纤维皮部石墨结构取向因子g*与X射线衍射表征的纤维整体石墨结构取向度π变化趋势相同，说明拉曼光谱表征结构取向的方法是有效的；与π相比，g*和纤维拉伸模量存在更好的线性关系，表明皮部石墨结构取向对纤维整体模量的贡献更大、更直接。

Characterization of the orientation of graphite structures of polyacrylonitrile(PAN)-based carbon fibers by Raman spectroscopy

PAN-based carbon fibers with different orientation have been characterized by Raman spectroscopy of both cross-section and surface areas. The method of characterizing the graphite structure orientation by Raman spectroscopy involved analyzing the relationship between the orientation and the tensile modulus of the fibers. The results showed that the growth trends of g* (the graphite structure orientation factor of the skin region of fibers characterized by Raman spectroscopy) and π（the graphite structure orientation degree of the whole fiber characterized by XRD) were almost the same, which proved the effectiveness of the Raman test method for determining the graphite structure orientation of the skin region of the fibers. The linear relationship betweeng* and the tensile modulus was better than that between π and the tensile modulus, which indicates that the graphite structure orientation of the skin region contributes more directly to the tensile modulus of carbon fibers.