The use of renewable monomers and green polymerization processes for preparing new synthetic polymers is a hot topic today. In this work we have obtained high molecular weight copolyesters derived from ω-pentadecalactone (PDL), dimethyl succinate (DMS) and 1,4-cyclohexanedimethanol (1,4-CHDM) by a combination of ring opening polymerization (ROP) and two step melt polycondensation processes. The reaction has been carried in bulk under mild conditions (80–120 °C) and catalyzed by immobilized Candida artarctica lipase B (N435 biocatalyst). These reactions were followed by ¹H NMR and it was observed that although PDL reacted faster, at the end copolyesters displayed a random microstructure due to transesterification reactions taking place during polymerization. These copolyesters were thermally stable up to around 350 °C and semicrystalline for all compositions with melting temperatures decreasing with the increased content of the counterpart comonomer up to a pseudo-eutectic point located at 40 mol-% of PDL composition. The crystalline structure and transitions taken place by heating have been studied by WAXS and SAXS synchrotron X-ray diffraction. Copolyesters with elastomeric properties could be obtained at intermediate compositions.

使用可再生单体和绿色聚合工艺制备新型合成聚合物是当今的热门话题。在这项工作中，我们通过开环聚合 (ROP) 和两步法的组合获得了衍生自 ω-十五内酯 (PDL)、琥珀酸二甲酯 (DMS) 和 1,4-环己烷二甲醇 (1,4-CHDM) 的高分子量共聚酯熔融缩聚过程。该反应在温和条件 (80–120 °C) 下大量进行，并由固定化的Candida artarctica脂肪酶 B（N435 生物催化剂）催化。这些反应之后是¹H NMR 和观察到，尽管 PDL 反应更快，但由于在聚合过程中发生酯交换反应，最终共聚酯显示出随机的微观结构。这些共聚酯在高达约 350 °C 的温度下是热稳定的，并且对于所有组合物来说都是半结晶的，熔化温度随着对应共聚单体含量的增加而降低，直到假共晶点位于 PDL 组合物的 40 mol-%。通过 WAXS 和 SAXS 同步加速器 X射线衍射研究了晶体结构和因加热而发生的转变。可以在中间组合物中获得具有弹性特性的共聚酯。