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采用Ｘ射线衍射（ＸＲＤ）方法与理论，对Ａｐｍｏｃ—Ｉ和Ｋｅｖｌａｒ—４９纤维进行了Ｘ射线衍射测试。应用图解分峰法对衍射图中结晶峰与非结晶峰进行了分离，分别计算出各结晶峰与非结晶峰的相对积分强度，从而计算出各自结晶度及晶面间距的大小，其中Ａｐｍｏｃ—Ｉ和Ｋｅｖｌａｒ—４９纤维的结晶度分别为５２．３４％与６８．６８％，同时分析了两种纤维结晶程度、晶面间距差别的原因。然后把两种纤维分别溶于浓Ｈ２ＳＯ４，再加蒸馏水使其重新从Ｈ２ＳＯ４溶液中析出，用同样的方法分析了析出粉末的结晶状况。最后讨论了两种纤维结晶状况与其物理和力学性能的关系。
X-ray diffraction of Apmoc-I and Kevlar-49 fibers was carried out by X-ray diffraction (XRD) and theoretical analysis. The crystallization peak and the non-crystallization peak in the diffraction pattern were separated by using the graph-splitting method, and the relative integral intensities of each crystallization peak and the non-crystallization peak were respectively calculated to calculate the respective crystallinity and interplanar spacing. The Apmoc- The crystallinity of I and Kevlar-49 fibers were 52.34% and 68.68%, respectively. The reasons for the difference in crystallinity and interplanar spacing between the two fibers were also analyzed. The two fibers were then dissolved in concentrated H2SO4, respectively, and distilled water was added to re-precipitate from the H2SO4 solution. The crystallization of the precipitated powder was analyzed by the same method. Finally, the relationship between the crystalline state of the two fibers and their physical and mechanical properties is discussed.