中文摘要：

聚己内酯（PCL）是一种可生物降解的高分子材料，有良好的生物相容性，可用于药物可控释放载体材料，因此对它的研究具有很高的实用价值。研究了双负离子β-二亚胺基稀土胺化物对ε-己内酯（ε-CL）开环聚合的催化行为，发现它们均能高活性地引发ε-己内酯的开环聚合，所得聚合物的分子量分布相对较窄，中心金属对催化聚合的活性影响较大，其活倒顷序为Sm〉Gd〉Y≈Yb。

英文摘要：

Dianionic β-diketiminate lanthanide amides were found to be efficient catalysts for the ring-opening polymerization of ε-caprolactone, with higher catalytic reactivity and narrow PDI of the polymer. It was noted that the activity was largely influenced by the central metals. The activity decreased with the decrease of the size of lanthanide metals and the activity sequence was Sm〉Gd〉Y≈ Yb.