【摘要】 采用Ｘ射线衍射仪、示差扫描热分析仪及偏光显微镜对热致液晶聚酯酰亚胺进行了研究。ＤＳＣ曲线上都有明显的玻璃化转变（Ｔ＿ｇ）及两个熔融峰（Ｔ＿（ｍ１）、Ｔ＿（ｍ２）），表明聚合物具有明显的液晶性；ＷＡＸＤ曲线上在２θ＝２０°左右可观察到较强的衍射峰，在２θ＜１３°的小角范围内也可观察到多个比较尖锐的衍射峰，前者表明分子链横向排列，间距在４．５～５Ａ，后者表明聚合物分子径向采取较完美的层状超分子结构顺序排列，以上结果证实了共聚物是近晶型结构；偏光显微镜下观察到了棒状或小锥状的近晶型液晶的典型织构，进一步支持了ＷＡＸＤ所得结论。更多还原

【Abstract】 A series of thermotropic liquid crystal poly （ester imide） s derived from 1, 5-pentamethylenediaine, 1, 10-decanediamine, and p-phenylenebis-（trimilitic） dianhydride were synthesized via a solution polycondensation process . The poly （ester imide） s were characterized by WAXD,DSC measurements, and polarizing microscope. WAXD measurements indicated that sharp reflections were detectable at beth 2θ<13°and 2θ=20°, which fit a typical smectic WAXD pattern.the results revealed that the samples posessed a sharp endotherm (T_ml) and a second endotherm (T_m2) which indicated the phase transitions. Under polarizing miscroscope,the samples showed a obvious birefringent patterns in the temperature range between T_m1 and T_m2, and small conic texture or batonnets texture （typical smectic granular texture） were observed.更多还原