【摘要】 <正> 晃玉等曾以BF₃-二元醇（DO）引发四氢呋喃（THF）与环氧氯丙烷（ECH）共聚合,用所得共聚醚制成嵌段聚醚聚氨酯,与用THF均聚醚或THF-环氧丙烷（PO）共聚醚为软段的聚氨酯相比,分别在低温性能及强度上有明显改进.且由于引入氯甲基侧基可作进一步接枝共聚改性。但用BF₃-DO为引发剂很难制得不含环聚体的共聚醚,更多还原

【Abstract】 The yield of copolymerization of tetrahydrofuran(THF) and epichlorohydrin(ECH, 10%, by wt.) using a binary catalyst of fuming sulfuric acid(21% or 28%) and perchloric acid or sodium perchlorate is higher than 60%. The average molecular weight of the product can be controlled in the range of 1000-2000 by varying the catalyst system. The hydroxyl functionality of the product is equal to 2, and the end-groups are predominantly primary hydroxyls(around 70-80%).更多还原