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在有效采集湿法纺丝凝固成形的PAN纤维二维小角X射线散射(SAXS)图像的基础上,通过理论模型的建立和散射强度的计算,对散射信息中的微孔结构和长周期结构的叠加信号进行了合理的分离,获得了纤维中长周期结构信息。结合相关函数分析方法,计算了长周期中准晶区厚度、非晶区厚度等结构参数,建立了PAN纺丝过程中凝固纤维的长周期特征结构的研究分析方法。同时,采用广角X射线衍射(WAXD)方法测定纤维的结晶度,验证了所建立方法的准确性。
Based on the two-dimensional small-angle X-ray scattering (SAXS) images of PAN fibers collected by wet spinning and solidification, through the establishment of theoretical model and the calculation of the scattering intensity, the microstructure and the long-period structure The superposition signals were separated reasonably and the long-period fiber structure information was obtained. Combined with the correlation function analysis method, the structural parameters such as the thickness of the quasicrystal zone and the thickness of the amorphous zone in the long period are calculated, and the analytical method of the long period characteristic structure of the solidified fiber in the PAN spinning process is established. At the same time, WAXD method was used to determine the crystallinity of the fibers, which verified the accuracy of the established method.