Abstract: Adipic acid copolymer solution was synthesized, using this as liquid medium, the liquid phase pyrocondensation polymerization of aspartic acid was investigated.When the hydroxyl value of the copolymer solution less than 310mgKOH/g and acid value less than 5mgKOH/g, PSI yield was 90.5%—93.4%, more than the yield of 86.8% in the same reaction condition of solid phase pyrocondensation polymerization.The effects of reaction temperature, reaction time and dosage of catalyst on pyrocondensation polymerization of L-ASP have been discussed.When the reaction temperature was 200℃, reaction time was 2 hours, dosage of catalyst was 8%, the yield of PSI was 93.4%, and the optimum reaction conditions were obtained.The number-average molecular weight of PSI was 39956, and molecular weight distribution coefficient was 1.16.This study also analyzed the comparison of infrared spectrum of PSI products from different pyrocondensation polymerization conditions.

Key words: adipic acid copolymer, aspartic acid, liquid phase pyrocondensation polymerization, poly-succinimide

摘要： 研究合成了己二酸共聚物溶液,并以此作为天冬氨酸聚合的液相介质,研究了天冬氨酸在此液相介质中的热缩聚反应。当共聚物溶液羟值在310mgKOH/g以下、酸值在5mgKOH/g以下时,聚琥珀酰亚胺(PSI)得率为90.5% ～93.4%,大于相同反应条件下天冬氨酸固相热缩聚86.8%的得率。探索了反应温度、反应时间和催化剂用量对天冬氨酸热缩聚和的影响,当反应温度为200℃,反应时间为2h,催化剂用量为8%时,液相介质中热缩聚产物PSI产率为93.4%,数均相对分子质量为39956,相对分子质量分布系数为1.16。本研究还对不同热缩聚条件所得的PSI产物进行了红外光谱对比分析。

关键词: 己二酸共聚物, 天冬氨酸, 液相热缩聚, 聚琥珀酰亚胺