聚乙醇酸（PGA）具有优异的降解性能和机械强度，然而较差的韧性在一定程度上阻碍其应用。为了充分利用PGA优异的降解性能和机械强度，同时提高PGA的韧性和加工性能，从分子链结构出发，通过乙交酯与ε-己内酯的开环聚合的方式制备聚（乙交酯-共-己内酯）（PGACL）共聚酯，并进一步通过扩链剂1，4-丁二醇缩水甘油醚（BDE）调节共聚物的性能。在确定引发剂最佳用量的前提下，研究共聚酯中乙交酯含量和扩链剂用量对共聚酯力学性能、热性能、降解性能的影响。结果表明：乙交酯含量的增加可显著提高共聚酯的热性能、结晶性能和机械强度，而扩链剂的引入大幅度提高了PGACL的韧性，同时合成的PGACL共聚酯具有良好的降解性能。

Polyglycolic acid (PGA) has excellent degradation performance and mechanical strength, but its poor toughness limits its further application to some extent. In order to fully utilize the excellent degradation performance and mechanical strength of PGA, and to improve its toughness and processing performance, a copolymer of poly(glycolide-co-caprolactone) copolyesters (PGACL) was prepared through the ring-opening polymerization of glycolide and ε-caprolactone, starting from the molecular chain structure. The properties of PGACL were further regulated by the chain extender 1,4-butanediol glycidyl ether (BDE). By determining the optimal amount of initiator, the effects of the content of glycolide and chain extender on the mechanical properties, thermal properties, and degradation performance of copolyesters were studied. The results showed that increasing the glycolide content significantly enhanced the thermal properties, crystallinity, and mechanical strength of the copolyester. The introduction of the chain extender greatly improved the toughness of PGACL, while the synthesized PGACL copolymer maintained good degradability.