甘油基生物可降解聚酯弹性体合成工艺改进及性能影响

To address environmental concerns caused by traditional fossil-based elastomers, the development of bio-based biodegradable polyester elastomers has become a focus of current research. In this study, glycerol-based polyester elastomers with controllable crosslinking networks were synthesized via optimized melt polycondensation using bio-based diacids, diols, and glycerol. By controlling the degree of esterification between dicarboxylic acids and diols when introducing glycerol, an enhancement in the elasticity of polyester cross-linked elastomers was achieved (with a gel content of approximately 31% and a sol molecular weight ranging from 2. 84 to 7. 76 kg/mol). Differential scanning calorimetry (DSC) confirmed the completely amorphous nature of the elastomers, with glass transition temperatures (Tg) ranging from −49 to −47 ℃. In scaled-up 5 L reactor experiments, high-elasticity mate⁃ rial was successfully prepared (gel content: 33. 53%, sol molecular weight: 7. 25 kg/mol) by optimizing the process parameters. This work not only provides a new route for developing environmentally friendly chewing gum but also establishes valuable insights for future engineering applications of bio-based elastomers.