近年来，聚己二酸-对苯二甲酸丁二醇酯/热塑性淀粉/有机蒙脱土（PBAT/TPS/OMMT）可降解材料受到广泛关注。然而，传统双螺杆加工技术会导致物料降解，且难以实现OMMT的良好剥离。为提高其力学性能，使用ADR-4468对PBAT进行扩链改性，采用摄动环差速双螺杆挤出机熔融挤出制备含有不同含量改性PBAT（A-PBAT）的PBAT/TPS/OMMT，分析A-PBAT含量对复合材料微观结构、流变特性、相容性、吸水性与力学性能的影响规律。结果表明：扩链剂有效提高了PBAT的力学性能，差速双螺杆可良好剥离OMMT，并使TPS均匀分散分布于PBAT中。随着A-PBAT含量的提高，TPS从连续相向分散相转变，复合材料吸水性逐渐降低，拉伸强度逐渐提高，在A-PBAT质量分数为60%时达到最大，断裂伸长率轻微降低。20%的A-PBAT可有效提高TPS和PBAT的相容性。

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.