Synthesis process optimization and performance of a glycerol-based biodegradable polyester elastomer

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 (T_g) ranging from -49 to -47 ℃. In scaled-up 5 L reactor experiments, high-elasticity material 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.