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采用扫描透射X射线显微镜(STXM),对聚丙烯腈(PAN)预氧化纤维截面进行具有30 nm空间分辨率的元素分布研究,结合将两幅吸收图上对应像素点的光密度相比求解元素分布的双能衬度分析法,获得氧元素在PAN预氧化纤维截面上的分布信息.STXM实验结果表明,氧元素在PAN原丝截面上分布是均匀的;经过预氧化后,PAN纤维皮层的氧含量升高而芯层保持不变,形成了皮层富含氧的皮芯结构.实验数据表明氧的径向扩散速度约为0.033μm/min.结果表明STXM是分析PAN纤维内部微结构的有效新型手段,有助于更深入的理解PAN纤维皮芯结构的演化机制.
The scanning electron microscopy (STXM) was used to study the elemental distribution of polyacrylonitrile (PAN) pre-oxidized fiber with a spatial resolution of 30 nm. By combining the optical densities of the corresponding pixels on the two absorption spectra, Distribution of the dual-energy contrast analysis of oxygen elements in the PAN pre-oxidation fiber section of the distribution of information.STXM experimental results show that the distribution of oxygen in the PAN filament cross-section is uniform; after pre-oxidation, PAN fiber cortex The oxygen content increases while the core layer remains unchanged, forming a skin-rich oxygen-rich skin core structure.The experimental data show that the radial oxygen diffusion rate of about 0.033μm / min.The results show that STXM is effective PAN fiber internal microstructure analysis The new method helps to understand the evolution mechanism of PAN fiber sheath structure.