Novel polyimides, optionally end-capped with polymerizable or inert groups, and the polyamic acid or ester intermediates thereof are prepared by reacting a tetracarboxylic acid compound (e.g. pyromellitic dianhydride or 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride or its methyl diester) with diamines having the general formula
wherein Z is oxygen or sulfur, X and/or Y are carbonyl or carbinol groups, the amine groups may be in the 2-, 3-, and/ or 4-position, and isomerism is present when X and/or Y is a carbinol group. The polyimides may be end-capped by reaction, during or after their formation, with polymerizable groups such as 3-aminophenyl acetylene or 3,6-endomethy- lene-1,2,3,6-tetrahydrophthalic anhydride. The diamines are novel classes of amines when Z is sulfur and when Z is oxygen and X, Y, or X and Y are carbinol groups.
新型聚
酰亚胺(可选择以可聚合基团或惰性基团封端)及其聚酰胺酸或酯中间体是 通过四
羧酸化合物(例如,
吡咯烷二酸酐或 3,3',4,4'-
二苯甲酮四
羧酸二酸酐或其甲基二酯)与通式如下的 二胺反应制备的
其中 Z 为氧或
硫、X 和/或 Y 为羰基或碳醇基团,胺基团可位于 2、3 和/或 4 位,当 X 和/或 Y 为碳醇基团时,存在同分异构现象。在聚
酰亚胺形成过程中或形成后,可通过与
3-氨基苯乙炔或 3,6-内甲基-1,2,3,6-四氢
邻苯二甲酸酐等可聚合基团反应,对聚
酰亚胺进行封端。当 Z 为
硫和 Z 为氧以及 X、Y 或 X 和 Y 为羟基时,二胺是新型
胺类。