以邻甲基苯胺和联苯甲醛为起始原料,经一步有机反应,合成了一种新型二胺单体3,3’-二甲基-4,4’-二氨基-联苯基甲烷(1).将二胺单体(1)分别与4种商品化芳香二酐经一步法高温缩聚,制得了一系列可溶性聚酰亚胺PI,其特性黏度在0.62 ～ 0.80 dL/g之间.该类聚酰亚胺表现出优异的溶解性能,室温下不仅可以溶于高沸点的甲基吡咯烷酮(NMP)、二甲基乙酰胺(DMAc)、二甲基甲酰胺(DMF)溶剂中,而且还能溶于低沸点的CHCl3、CH2Cl2等溶剂中.由该聚合物溶液涂覆所制聚酰亚胺薄膜具有浅的颜色和高的光学透明性,其中由二胺单体1和二苯醚酐所制薄膜的截断波长在346 nm,400 nm处的透过率超过70％.此外该系列聚酰亚胺还表现出良好的热学性能,玻璃化转变温度在300℃以上.空气和氮气中10％热失重温度分别在400℃和500℃以上.
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