Unsaturated copolyesters poly(butylene succinate-co-cis-butene succinate) (P(BS-co-cBS)) were the first time prepared by polycondensation in combination with stannous octoate as catalyst and 4-methoxyphenol as radical inhibitor, achieving linear random copolyesters with a number-average molecular weight up to 38.2 kg/mol. The cis-2-butene-1, 4-diol used in this work showed a peculiarity of no isomerization or cross-linking side reaction even at high reaction temperatures, due to the high chemical stability of the unconjugated cis-double bond. Isodimorphic behavior between butylene succinate (BS) and cis-butane succinate (cBS) in P(BS-co-cBS) was evidenced by DSC and WAXD analyses. Then, the competition and miscibility of isodimorphism between BS and cBS units were further investigated by thermodynamic analyses. The significant discrepancy in competition and miscibility between BS and cBS units from conformational geometry demonstrated unique physicochemical properties and structure-properties relationships in such system of unsaturated copolyesters. A great impact of competition and miscibility on band spherulites and mechanical properties of the copolyesters was observed and discussed. In conclusion, our work here not only clarifies the effect of cis-double bond on isodimorphism in the unsaturated copolyesters, but also gives an insight into the mechanism of how the competition and miscibility regulates their physical properties.

不饱和共聚酯聚丁二酸丁二酯-顺-顺丁烯丁二酸酯（P（BS-co- c BS））首次通过缩聚反应与辛酸亚锡作为催化剂和4-甲氧基苯酚作为自由基抑制剂联合制备，实现了线性无规数均分子量高达38.2 kg / mol的共聚酯。由于未缀合的顺式双键的高化学稳定性，即使在较高的反应温度下，用于这项工作的顺式-2-丁烯-1、4-二醇也显示出没有异构化或交联副反应的特性。丁二酸丁二酯（BS）与顺式丁二酸丁二酯（c BS）在P（BS-co- cDSC和WAXD分析证明了BS）。然后，通过热力学分析，进一步研究了BS和c BS单元之间同构同构的竞争和可溶性。BS和c BS单元之间的竞争和可混溶性与构象几何的显着差异表明，在这种不饱和共聚酯体系中，其独特的理化性质和结构-性质关系。观察和讨论了竞争性和混溶性对带状球晶和共聚酯机械性能的巨大影响。总之，我们在这里的工作不仅阐明了顺式的作用-双键在不饱和共聚酯中的同构上，但也提供了竞争和可混溶性如何调节其物理性质的机理的见解。