A series of triblock copolyesters were produced by ring-opening polymerization of l-lactide initiated by the dihydroxy-terminated poly(alkylene dodecanedioate)s as macroinitiators. The dihydroxy-terminated poly(alkylene dodecanedioate)s as low melting blocks were prepared by using 1,12-dodecanedioic acid and methyl substituted aliphatic diols. The influence of the different polyesters middle block on microstructure, thermal, crystallization and tensile properties of the triblock copolyesters was investigated. It was found that the poly(alkylene dodecanedioate)s containing methyl substitutions still exhibited crystallization and melting behavior, but the crystallization ability decreased when compared with linear poly(alkylene dodecanedioate). The diffraction peaks of soft and hard segments, measured by WAXD, showed a gentle trend after copolymerization. Through the TGA test, the results showed that thermal stability of the triblock polyesters was improved. Tensile tests exhibited that the elongation at break was improved significantly, with the highest elongation at break reaching 400%, while the tensile strength of triblock copolyesters decreased slightly compared with polylactide. The correlation between the middle block structures and their physical properties was explored and discussed.

一系列的三嵌段共聚酯的通过的开环聚合产生的升-丙交酯由作为大分子引发剂的二羟基封端的聚（亚烷基十二烷二酸酯）引发。通过使用1，12-十二烷二酸和甲基取代的脂族二醇制备低熔点嵌段的二羟基封端的聚（亚烷基十二烷二酸酯）。研究了不同的聚酯中间嵌段对三嵌段共聚酯的微观结构，热学，结晶和拉伸性能的影响。发现含有甲基取代的聚（亚烷基十二烷二酸酯）仍显示出结晶和熔融行为，但是与线性聚（亚烷基十二烷二酸酯）相比，结晶能力降低。通过WAXD测量的软链段和硬链段的衍射峰在共聚后显示出平缓的趋势。通过TGA测试，结果表明，三嵌段聚酯的热稳定性得到改善。拉伸试验表明，断裂伸长率明显改善，最高断裂伸长率达到400％，而三嵌段共聚酯的拉伸强度与聚丙交酯相比略有下降。探索并讨论了中间嵌段结构与其物理性质之间的相关性。