Biodegradable poly(butylene succinate) (PBS) has extensively been studied; however, its relatively high crystallinity and poor toughness restricts its wide application. In this research, novel poly(butylene succinate)-b-poly(diethylene glycol terephthalate) (PBS-b-PDEGT) multiblock copolyesters with different mass ratios of amorphous hard PDEGT and crystallizable soft PBS segments were successfully synthesized and confirmed by hydrogen nuclear magnetic resonance. Both PBS homopolymer and PBS-b-PDEGT multiblock copolyesters displayed high thermal stability. In PBS-b-PDEGT multiblock copolyesters, PBS and PDEGT segments were partially miscible in the amorphous region. Compared with PBS homopolymer, the introduction of PDEGT segment slightly reduced the melting point of PBS-b-PDEGT multiblock copolyesters. The crystallization mechanism and crystal structure of PBS segment did not change. With the increase of the PDEGT segment content, the Young's modulus of PBS-b-PDEGT multiblock copolyesters gradually decreased, while the elongation at break remarkably increased. In brief, the synthesis of PBS-b-PDEGT multiblock copolyesters provides an efficient modification method of preparing novel PBS copolymers with still high melting point (about 110 °C) and significantly improved elongation at break (about 650% and above), which should be greatly important and helpful from a practical application viewpoint.

可生物降解的聚丁二酸丁二醇酯 (PBS) 已被广泛研究；但其较高的结晶度和较差的韧性限制了其广泛应用。在本研究中，成功合成了具有不同质量比的非晶硬 PDEGT 和可结晶软 PBS 链段的新型聚（丁二酸丁二醇酯）-b-聚（对苯二甲酸二乙二醇酯）（PBS- b - PDEGT）多嵌段共聚酯，并通过氢核磁验证谐振。PBS 均聚物和 PBS- b - PDEGT 多嵌段共聚酯均显示出高热稳定性。在 PBS- b-PDEGT 多嵌段共聚酯、PBS 和 PDEGT 链段在非晶区部分混溶。与 PBS 均聚物相比，PDEGT 链段的引入略微降低了 PBS- b - PDEGT 多嵌段共聚酯的熔点。PBS 链段的结晶机理和晶体结构没有改变。随着PDEGT链段含量的增加，PBS- b - PDEGT多嵌段共聚酯的杨氏模量逐渐降低，而断裂伸长率显着增加。简言之，PBS- b的合成-PDEGT 多嵌段共聚酯为制备具有仍然高熔点（约 110 °C）和显着提高断裂伸长率（约 650% 及以上）的新型 PBS 共聚物提供了一种有效的改性方法，这在实际应用中应该非常重要和有帮助观点。