Preparation of high elastic bimodal cells biodegradable foam

Poly(butylene adipate-co-terephthalate) (PBAT) and polybutylene succinate (PBS) are advanced biodegradable thermoplastic elastomer with excellent application prospects. There is a growing interest in developing PBAT foam products as effective alternatives to traditional foams for sports, shock absorption, and safety protection. In this study, high compression strength and high elasticity PBAT/PBS foam materials was prepared by supercritical CO₂ foam, the effects of the crystallization nucleation agent TMC and the chain extender ADR on crystallization and melt strength of blends was investigated by varying temperature-pressure modes (VT-PM). The rheological results showed that with the increase of ADR, the storage modulus and viscosity of PBAT/PBS blends increased significantly, transitioning from a viscous liquid-like to an elastic state. TMC could promote polymer crystallization, crystal size reduced, and small size cell was obtained during the foaming. Finally, a high elastic foam T/S-0.2-1.5 with 12 times and the compressive strength about 0.59 MPa and energy loss of 14.3 % can be prepared due to synergistic effect of ADR and TMC. This provides a promising application prospect for biodegradable foams.