由活性大分子环状前体合成环状聚ε-己内酯接枝聚L-乳酸

摘要

由2,2-二丁基-2-锡-1,3-二氧环庚烷引发ε-己内酯开环聚合制得环状聚ε-己内酯(3)；3与活性单体α-(1-丙烯酰氧乙基)-ε己内酯反应,合成了活性环状聚ε-己内酯(5)；5在UV辐照下发生分子内交联反应制得活性大分子引发剂6;6引发L-丙交酯接枝共聚合制得环状聚ε-己内酯接枝聚L-乳酸,其结构经NMR,SEC和DSC表征.%Macrocyclic poly(ε-caprolactone) (3) was prepared by the ring-opening polymerization of ε-caprolactone using 2,2-dibutyl-2-tin-l ,3-dioxacycloheptane as the initiator. Active macrocyclic po-ly(ε-caprolactone) (5) was synthesized by the reaction of 3 with active monomer α-(l-acryloxyeth-yl)-ε-caprolactone. Active macromolecule initiator(6) was prepared by intramolecular cross-linked reaction of 5 under UV irradiation. L-lactide graft copolymerization was initiated by 6 to give cyclic poly(ε-caprolactone)-g-poly( L-lactide). The structures were characterized by NMR, SEC and DSC.