【摘要】 以发烟硫酸-三氟化硼乙醚络合物为催化剂,研究了催化剂组成、氧对四氢呋喃开环聚合物收率和分子量的影响,并考察了催化剂活性。结果表明:在该催化体系中,聚合物收率可达70％,分子量可在1000—4000范围内任意调节,且分子量分布较窄;聚合反应不受氧的影响,反应初期,催化剂活性较高。更多还原

【Abstract】 Using a new binary catalyst system consisted of fuming sulfuric acid and boron trifluoride ethyl etherate, the cationic ring-opening polymerization of tetrahydrofuran was investigated for effects of the catalyst composition and oxygen on the polymer yield and average molecular weight. The results show that in this polymerization system, the polymer yield can reach 70%, and the average molecular weight can be controlled arbitrarily over the range of 1,000 through 4,000, and the molecular weight distribution of the polymer thus obtained is always narrow.Furthermore, the polymerization reaction is not affected by the existence of oxygen,and the polymerization system possesses relatively high activity even in the initial stages of polymerization.更多还原