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中文摘要：
通过粉末X射线衍射仪对不同工艺条件获得的PMDA-ODA型酰胺酸-酰亚胺共聚物（PA—I）粉末的XRD图谱进行分析表明，PA—I粉末为半晶粉末，使用消除无定型鼓包的XRD图谱指标化，计算出晶体结构为三斜晶系，空间群为P1。采用Pawley全谱精修晶体结构，结果表明。随着酰亚胺化时间的延长和酰亚胺化温度的提高，PMDA—ODA的晶胞参数、微晶尺寸和晶格畸变都呈现规律性变化。
英文摘要：
Copolyamic acid-imide （PA-I） powders with different imidization degree were prepared in solution by thermal imidization of polyamic acid （PAA） synthesized from pyromellitic dianhydride （PMDA） and 4,4＇-oxydianiline （ODA） on different reaction conditions. X-ray diffraction （XRD） results of these powders indicated that they are semi-crystalline. After all of amorphous PA-I bumps in XRD patterns were deducted, reflections of crystalline PA-I were used to index and calculate crystalline structure. The structure is triclinic and space group is P1. It is concluded that unit cell parameters, crystallite size and microstrain of PA-I powders change regularly as imidization time prolonged or imidization temperature rose by Pawley refinement of XRD patterns of crystalline portion.
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