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用三氟化硼乙醚络合物(BF3.OEt2)为催化剂,乙二醇(EG)为起始剂,甲苯作溶剂,通过阳离子开环聚合制备出了窄分子量分布(w/n<1.3)的端羟基环氧乙烷-四氢呋喃(TEO)共聚醚,探讨了聚合温度、时间、反应介质、加料方式、起始剂及单体配比对分子量及其分布的影响,采用凝胶渗透色谱-多角度激光散射联用仪(SEC-MALLS)对其分子量及分布进行准确的测定,并用IR和1HNMR对共聚醚结构进行了表征。研究表明:有EG存在时,采用一次加料的方式,以甲苯为溶剂,温度为0℃,单体配比为11,∶反应时间为5 h的条件下制得的共聚醚具有分子量分布较窄的特点。
A narrow molecular weight distribution was obtained by cationic ring-opening polymerization with ethylenediamine (EG) as starting material and toluene as solvent using boron trifluoride etherate (BF3.OEt2) as catalyst, 1.3), the effects of polymerization temperature, time, reaction medium, feeding method, initiator and monomer ratio on the molecular weight and its distribution were discussed. Gel permeation The molecular weight and distribution of the copolymer were characterized by SEC-MALLS and characterized by IR and 1HNMR. The results showed that the presence of EG in a single feeding mode with toluene as solvent, temperature of 0 ℃, monomer ratio of 11: reaction time of 5 h under the conditions of the copolyether has a narrow molecular weight distribution specialty.