Four-arm star copolymer [poly (EO-co-EEGE)]4 was first prepared by the anionic ring-opening copolymerization of EO and EEGE using pentaerythritol and diphenylmethylpotassium (DPMK) as co-initiator.

• 2．用季戊四醇与二苯甲基钾(DPMK)组成的引发剂体系引发乙氧基乙基缩水甘油醚（EEGE）与环氧乙烷(EO)阴离子共聚，通过改变单体投料比可以得到组成不同的四臂星型共聚物[poly(EO-co-EEGE)]4。