Polybutylene adipate-terephthalate/thermoplastic starch/organic montmorillonite(PBAT/TPS/OMMT)biodegradable materials have attracted wide attention in recent years.However,the conventional twin-screw processing technique leads to material degradation and makes it difficult to achieve good stripping of OMMT.In order to improve its mechanical properties,PBAT was chain expansion modified by ADR-4468,and PBAT/TPS/OMMT containing different contents of modified PBAT(A-PBAT)were prepared by melt extrusion using a perturbation ring dual-speed twin-screw extruder,and the effects of different contents of A-PBAT on the microstructure,rheological properties,compatibility,water absorption and mechanical properties of the composites were analyzed.The results showed that the chain extender effectively improved the mechanical properties of PBAT,and the dual-speed twin-screw could strip OMMT well and make TPS uniformly dispersed and distributed in PBAT.With the increase of A-PBAT content,TPS transforms from continuous phase to dispersed phase,the water absorption of the composite material gradually decreases,and the tensile strength gradually increases,reaching its maximum at a mass fraction of 60%A-PBAT,with a slight decrease in elongation at break.20%A-PBAT can effectively improve the compatibility between TPS and PBAT.
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