分别以三乙醇胺和四乙醇乙二胺为引发剂,用三(2,6-二叔丁基-4-甲基苯氧基)镧(La(DBMP)3)作催化剂,催化ε-己内酯开环聚合,制备了三臂和四臂星形聚己内酯.通过1H NMR表征了聚合物的星形结构以及分子量.研究表明,每一个催化剂分子可与多个引发剂分子作用,当三乙醇胺与La(DBMP)3的摩尔比值为1.7～6.4时,均可制得纯净的三臂星形聚己内酯.通过调节ε-己内酯与多元醇的摩尔比值,可以改变星形聚己内酯的分子量,实现聚合产物分子量可控.
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