主链含有β-二酮结构聚酰亚胺的合成与表征

Synthesis of Polyimides with β-Diketone Units in Main Chain

采用传统的“二步法”合成了5种主链含有β-二酮结构的聚酰亚胺（PI）.所得聚酰酸（PAA）的特性粘度值在0.31～1.00dL／g之间、热分析结果给出5种PI的玻璃化转变温度在296～312℃之间,10％热失重温度均在428℃以上.

A novel β-diketone diamine, 1-(4-aminophenyl)-3-(3-aminophenyl)-1, 3-propanedione (1) was prepared by reduction of the corresponding dinitro compound with hydrogen over 10% Pd/C. Five polyimides containing β-dike-tone units in main chain were prepared from the β-diketone diamine and aromatic dianhydrides. The intermediate poly(amic acid)s(3) had inherent viscosities of 0. 31-1.00dL/g. The polyimides obtained had glass-transition temperatures between 296℃ and 304℃ (by DSC) and 10 % weight loss temperatures above 428℃ in both air and nitrogen atmospheres.