摘要： 以辛酸亚锡为催化剂，通过熔融聚合的方法制备了己内酯 / 乙交酯 / 丙交酯三元嵌段聚酯共聚物，采用 GPC、FT-IR、¹ H NMR、XRD 等方法对聚酯共聚物的结构进行了表征，并测试了聚酯共聚物在天然海水中的吸水性能和降解性能。 用 HDI 三聚体对所合成聚酯共聚物进行固化，测试固化后树脂的力学性能及降解性能。 结果表明:通过调节树脂中己内酯链段含量，可控制固化树脂的力学弹性;在天然海水中的降解实验表明，随着己内酯链段含量降低，固化树脂降解速率加快，平衡后的水解速率基本维持在 5~10 μg/ (cm²·d)。

关键词: 己内酯, 乙交酯, 丙交酯, 嵌段共聚, 降解, 力学性能

Abstract: A triblock copolyester of caprolactone/glycolide/ lactide was prepared at the presence of stannous octoate as catalyst via the melt polymerization. The structure of the polyester copolymer were characterized by GPC, FT-IR,¹ H-NMR and XRD. Water absorption and degradation rate were tested by immersed in natural seawater. The polyester copolymer was cured with HDI and its mechanical properties and degradation rate were investigated. The result showed that the mechanical properties could be controlled by adjusting the content of caprolactone units in the polyester copolymer. The degradation test of the cured polyester showed that the lower caprolactone chain of the cured resin could lead to the faster of the degradation rate, and the rate of hydrolysis remained at 5~10 μg/ (cm²·d) after balance.

Key words: caprolactone, glycolide, lactide, block copolymer, degradation, mechanical properties