功能化离子液体催化对苯二甲酸二甲酯与乙二醇的聚合反应

Polymerization of Dimethyl Terephthalate and Ethylene Glycol Using Functional Ionic Liquids as Catalyst

以对苯二甲酸二甲酯(DMT)与乙二醇(EG)为原料,采用离子液体为催化剂,在无溶剂体系中合成聚对苯二甲酸乙二醇酯(PET).实验结果指出,当原料配比n(EG)∶n(DMT)=2∶1,反应温度为150℃,离子液LMS-4的用量为3.5%(g/g DMT)时,聚合物产率可达到94.1%,分子量Mw保持在2000左右.底物配比和催化剂用量等因素对产物分子量有一定影响.同时,对可能发生的反应历程进行了推测.

Poly ethylene terephthalate （PET） is synthesized by means of catalysis of ionic liquids in solvent-free system, using dimethyl terephthalate （DMT） and ethylene glycol （EG） as material. The experiment results show that the product yield of PET is 94.1% and the Mw is about 2 000 when the mol ratio of n（EG） ： n （DMT） is 2/1, reaction temperature at 150 ℃ , and the dosage of ionic liquids is 3.5% （g/g DMT）. The factors of the material proportion and the catalyst dosage have effect on the molecular weight of polymer. The possible reaction process is presumed well- founded in the study.