论文部分内容阅读
晃玉等曾以BF_3-二元醇(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BF_3-DO为引发剂很难制得不含环聚体的共聚醚,
Akihide and other BF_3-diol (DO) has been initiated by tetrahydrofuran (THF) and epichlorohydrin (ECH) copolymerization, with the resulting copolyether ether block polyether polyurethane, with THF homopolyether or THF- Propylene oxide (PO) copolyether is a soft segment of polyurethane, respectively, at low temperature performance and strength were significantly improved, and because of the introduction of chloromethyl side groups for further graft copolymerization. However, BF_3-DO as initiator is difficult to obtain without polyether copolymerization ether,