茂基二价钐配合物高效催化己内酯开环聚合  

High Effective Ring-open Polymerization of ε-Caprolactone Catalyzed by Bicycolopentadienyl Samarium(Ⅱ) Complex(C_5H_5)_2Sm(THF)

作　　者：齐民华[1,2] 贾惠芳[1] 刘智生[1] 沈琪[2] 沈之荃[3] 

机构地区：[1]茂名学院化工学院,茂名525000 [2]苏州大学化学化工系,苏州215006 [3]浙江大学高分子科学与工程系,杭州310027

出　　处：《高等学校化学学报》2010年第12期2518-2520,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20072027)资助

摘　　要：以茂基二价钐配合物(C5H5)2Sm(THF)作为单组分催化剂催化己内脂开环聚合反应,考察了催化剂用量、聚合反应时间和聚合反应温度对己内酯聚合反应的影响.结果表明,配合物(C5H5)2Sm(THF)对己内酯聚合有极高的催化活性且产物的数均分子量较高,当催化剂与单体摩尔比为1:5000时,聚合产率仍可达到50.3%,数均分子量可高达32.4×104;温度升高,聚合反应的转化率增加,聚合产物数均分子量降低;催化剂用量增加,聚合转化率增加,聚合产物分子量降低,聚合产物的分子量分布较窄;通过凝胶色谱法对聚合产物的分子量及分子量分布进行了表征.Lanthanide（Ⅱ） complex（C5H5）2Sm（THF） applied in catalyzing the polymerization of ε-caprolactone was investigated.The results indicated that the complex as single component catalyst showed very high activity and the number-average molecular weight of the polymer gained was also very high.For example,when the molar ratio of catalyst to monomer was 1：5000,the conversion could still reach 50.3% and the number-average molecular weight of the polymer gained was as high as 32.4×104.The conversion of the polymerization and the number-average molecular weight of the polymers were affected by temperature,time of polymerization and use level of catalyst in polymerization process.The number-average molecular weight of the polymer decreased,the molecular weight distribution was slightly wide,but the conversion increased as the polymerization temperature increasing.The conversion increased and the number-average molecular weight decreased as the dosage of catalyst increased.The molecular weight distribution of polycaprolactones gained were narrow.The number-average molecular weight and molecular weight distribution of polycaprolactone were measured by GPC.

关 键 词：钐 稀土配合物 己内酯 开环聚合 

分 类 号：O632.62[理学—高分子化学] O614.33[理学—化学]