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采用拉曼光谱技术研究了PAN基炭纤维表面微观结构的异质性. 借助于自制的旋装装置,实现了单根炭纤维纤维的旋转,利用拉曼面扫描技术获得了纤维整个外表面的拉曼光谱. 通过分峰数据处理,得到II/IG﹑IA/IG﹑IDi/IG 与ID/IG 的分布,发现这些结构参数具有较大的波动性,说明炭纤维表面微观结构是不均匀的. 进一步也计算出纤维表面的晶粒尺寸La 在0. 7-2. 9 nm间变化,结构缺陷有沿着纤维轴向取向的趋势. 通过拉曼旋转扫描,揭示出了炭纤维表面的复杂微观结构.

A polyacrylonitrile-based carbon fiber monofilament was characterized by a confocal micro Raman spectrometer with the aid of a stage that allowed the axial rotation of the fiber so that the whole surface area could be examined. Results indicate that disorder is localized and aligned along the axial direction of the fiber. La values in defective regions are relatively lower than in oth-ers. The changes in the amount of amorphous carbon in different regions are significant.

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