均配型三苄基稀土配合物的合成及在催化L-丙交酯聚合中的应用

摘要

Polylactide (PLA),an aliphatic polyester,can be biodegraded after use,and its metabolite is low toxic.The preferred method for PLA production is ring-opening polymerization (ROP) of lactide,a process initiated by metal complexes.Two homoleptic tris(o-dimethylaminobenzyl) complexes LnR3 (R =CH2C6H4-NMe2-o ; Ln =La,Y) have been prepared with rigorous exclusion of air and moisture using standard Schlenk techniques according to the methods provided in literature.They can be used as efficient catalysts for ring-opening polymerization of lactid.%聚丙交酯是一类可生物降解的脂肪族聚酯,而且降解产物无毒.丙交酯开环聚合是合成聚丙交酯的一种方便的方法.在无水无氧的条件下,参照文献合成了两种三苄基稀土配合物,它们可以有效地催化L-丙交酯的开环聚合,中心金属离子半径对催化效果有一定影响,并通过对齐聚物末端基的分析,得出了开环聚合物的机理与文献报道一致.