四氢呋喃(THF)通过正离子开环聚合而制得的聚丁二醇(PTMG)是生产嵌段聚醚聚氨酯及嵌段聚醚聚酯弹性材料的重要原料。目前制备PTMG所采用的引发剂都是强酸型的,如高氯酸、氟磺酸或发烟硫酸等,对设备腐蚀严重。用酸性较弱的三氟化硼引发聚合在文献上也有一些研究报道,但尚难以采用,其主要困难在于实际应用的 Tetrahydrofuran (THF) Polybutylene glycol (PTMG) prepared by ring-opening polymerization of a positive ion is an important raw material for producing block polyether polyurethanes and block polyether polyester elastomers. At present, the initiators used to prepare PTMG are all strongly acidic, such as perchloric acid, fluorosulfonic acid or oleum, which seriously corrode the equipment. Polymerization with a slightly acidic boron trifluoride has also been reported in the literature, but it is still difficult to use, the main difficulty lies in the practical application