Three kinds of bio-based polyester diols with different chain lengths, including polylactide diol (PLA-D), poly(ε-caprolactone) diol (PCL-D) and poly(ε-caprolactone-co-lactide) diol (PCLA-D), were synthesized by controlled ring-opening polymerization (ROP). Then UV-curable polyester acrylate resins (PLA-DA, PCL-DA and PCLA-DA) were synthesized by esterification modifying bio-polyols with methacrylic anhydride. Furthermore, the effects of chain length and polymer composition on the UV-curing and mechanical properties of polyester resins were investigated. The viscosity of both PLA-DA and PCL-DA increased sharply with the increase of molecular weight, and PCL can reduce the viscosity of PCLA-DA effectively. In the study of UV-curing kinetics, the increase of viscosity has a negative effect on the conversion and curing of double-bonds. The change trend of gel contents is basically consistent with the curing kinetics. The results of mechanical properties showed that the viscosity and double-bond conversion of the resins had a decisive influence on the mechanical properties of UV-cured materials. It was also found that with the increase of double-bond conversion and cross-linking density, the volume shrinkage of UV-cured materials increased significantly. The results of thermal analysis showed that the thermal stability of PCL-DA was better than that of PLA-DA, and the addition of PCL segments enhanced the thermal stability of PCLA-DA.

三种具有不同链长的生物基聚酯二醇，包括聚丙交酯二醇（PLA-D），聚（ε-己内酯）二醇（PCL-D）和聚（ε-己内酯-共聚物）-丙交酯）二醇（PCLA-D）是通过受控的开环聚合（ROP）合成的。然后，通过用甲基丙烯酸酐对生物多元醇进行酯化改性，合成了可紫外线固化的聚酯丙烯酸酯树脂（PLA-DA，PCL-DA和PCLA-DA）。此外，研究了链长和聚合物组成对聚酯树脂的紫外线固化和机械性能的影响。随着分子量的增加，PLA-DA和PCL-DA的粘度均急剧增加，而PCL可有效降低PCLA-DA的粘度。在紫外光固化动力学的研究中，粘度的增加对双键的转化和固化具有负面影响。凝胶含量的变化趋势基本上与固化动力学一致。力学性能的结果表明，树脂的粘度和双键转化率对紫外线固化材料的力学性能具有决定性的影响。还发现，随着双键转化率和交联密度的增加，UV固化材料的体积收缩率显着增加。热分析结果表明，PCL-DA的热稳定性优于PLA-DA，而PCL链段的加入增强了PCLA-DA的热稳定性。