歧化松香聚乙二醇苹果酸酯的微波合成研究

在微波辐射下,先将歧化松香与聚乙二醇进行酯化反应,合成中间体歧化松香聚乙二醇酯,再将中间体与苹果酸进行酯化反应,合成目标产物歧化松香聚乙二醇苹果酸酯,研究了中间体和目标产物的合成条件。结果表明:①中间体合成的最佳条件为:反应时间90 m in,反应温度240℃,歧化松香与聚乙二醇的摩尔比为1∶1.6;②目标产物合成的最佳条件为:反应时间60 m in,反应温度140℃,微波功率800 W。利用IR、UV等测试技术对中间体及目标产物进行了结构表征,并测定了它们的主要表面性能。结果表明,中间体和目标产物均为性能优良的新型非离子表面活性剂。

Microwave-assisted synthesis of disproportionated rosin-polyethylene glycol-malic acid ester

Under m icrowave irrad iation,d isproportionated rosin-polyethylene glycol ester was synthesized by esterification as an intermed iate using d isproportionated rosin and polyethylene glycol as starting mate-rials,and then the target product d isproportionated rosin-polyethylene glycol-malic acid esterwas prepared by further esterification of the intermed iate and malic acid.The optimum synthetic cond itions of the inter-med iate and target productwere investigated.The optimum synthetic cond itions of the intermed iate were found to be as follows: reaction time 90 m in,reaction temperature 240℃,the mole ratio of d isproportiona-ted rosin to polyethylene glycol 1∶1.6.The optimum synthetic cond itions of target productwere found to be as follows: reaction time 60 m in,reaction temperature 140℃,m icrowave power 800 W.The intermed i-ate and target productwere analyzed and identified by IR and UV spectra.In add ition,theirmajor surface properties were determ ined.The results showed that both the intermed iate and the target productwere no-vel and excellent nonionic surfactants.