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以液氨和马来酸酐为原料合成聚天冬氨酸,研究了马来酸酐与液氨的摩尔比、顺丁烯二酸铵盐合成温度和时间、聚合反应温度和时间以及水解pH等对聚丁二酰亚胺产率和聚天冬氨酸分子质量的影响。并用FTIR对合成的聚天冬氨酸的结构进行表征。结果表明,较佳的反应条件为:n(顺酐)∶n(液氨)=1∶1.2,顺丁烯二酸铵盐合成温度为85℃,反应时间为2 h,聚合反应温度为210℃,聚合反应时间为4 h,水解pH为9.0。在无催化剂条件下,聚丁二酰亚胺产率可高达95%以上,聚天冬氨酸重均分子质量高于7 500。
Poly (aspartic acid) was synthesized from liquid ammonia and maleic anhydride. The molar ratio of maleic anhydride to liquid ammonia, the synthesis temperature and time of ammonium maleate, the polymerization temperature and time and the pH of hydrolysis The yield of polysuccinimide and the molecular weight of polyaspartic acid. The structure of synthesized polyaspartic acid was characterized by FTIR. The results showed that the optimum reaction conditions were as follows: n (maleic anhydride): n (liquid ammonia) = 1: 1.2, the temperature of synthesis of maleic acid ammonium salt was 85 ℃, the reaction time was 2 h and the polymerization temperature was 210 ℃, the polymerization time is 4 h, the hydrolysis pH is 9.0. In the absence of a catalyst, the yield of polysuccinimide can be as high as above 95% and the weight average molecular weight of polyaspartic acid is above 7,500.