[Hmim]HSO4离子液体中微波合成聚天冬氨酸方法研究

以L-天冬氨酸为原料,在Hmim]HSO4离子液体中微波合成聚天冬氨酸(PASP)。研究了在该反应体系中n(L-Asp):n(L-Asp+Hmim]HSO4)、微波功率、反应时间对聚天冬氨酸收率的影响,利用红外光谱和核磁共振对产品结构进行了表征。结果表明:合成产品具有酰亚胺和羰基结构。聚合的最佳条件为:n(L-Asp)∶n(L-Asp+Hmim]HSO4)=0.45∶1、微波功率320 W、聚合时间260 s,在此条件下,收率可达96.1%。该方法产品收率比传统液相聚合法提高了11.5%。分析认为Brφnsted酸性离子液体能够促进L-Asp生成碳正离子,加速质子转移生成酰胺键。

Microwave synthesis of polyaspartic acid in [Hmim]HSO4 ionic liquid

Polyaspartic acid(PAS P)has been synthesized in the medium of HSO4 ionic liquid with microwave by using L-aspartic acid as raw material.The influences of n(L-Asp) ∶n(L-Asp +HSO4),microwave power and polymerization time on PASP yield coefficient are studied.The product structure is analyzed with infrared spectrum and 1HNMR spectroscopy.The results show that the obtained product has the configuration of imide and carbonyl.The optimal conditions of polymeric reaction are as follows:n(L-Asp) ∶n(L-Asp + HSO4)=0.45∶1,microwave power is 320 W and reaction time 260 s.Under the above conditions,the yield coefficient reaches 96.1% and it has increased by 11.5%,compared to the traditional liquid-phase polymerization process.It is considered that Brφnsted acid ionic liquid can expedite L-Asp to generate carboniumion,speed up the proton translocation,and create amido link.