The property profile of thin thermoplastic starch (TPS)/poly(butylene succinate) (PBS) films was investigated and the potential improvement, which can be achieved due to the utilization of hydrophilic/hydrophobic compatibilizer systems, was assessed. The evaluation in terms of morphology exhibited a very good TPS dispersion (under optimized processing conditions) within the polyester matrix, while an average particle size of 1.5 µm was obtained. Two different raw material approaches were applied for the preparation of the compatibilizers: (a) native corn starch and (b) destructurized TPS. In the course of the compounding process 0.5 and 1.0 wt% of the two compatibilizer systems (a) and (b) were added. In comparison, the addition of the TPS-based compatibilizer resulted in improved incorporation of TPS within the polyester matrix, which was accompanied by higher tensile strength and tear resistance. Explanations for this observation could be that pre-plasticized starch provides a larger reaction surface and enables better homogenization during the course of compounding. In contrast, for native starch the reaction only can take place at the granule surface and thus, the compatibilization was less efficient. The outcome of this investigation is a compostable film material with high bio-based content, which exhibits great potential for single-use, light-weight packaging applications.

中文翻译：

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淀粉/聚丁二酸丁二醇酯增容剂：不同反应方式对热塑性淀粉基可堆肥薄膜性能的影响

研究了热塑性淀粉（TPS）/聚丁二酸丁二醇酯（PBS）薄膜的性能，并评估了由于利用亲水/疏水增容剂系统而可能实现的潜在改进。在形态方面的评价显示出在聚酯基质中非常好的TPS分散性（在优化的加工条件下），而获得的平均粒径为1.5μm。两种不同的原料方法都用于制备相容剂：（a）天然玉米淀粉和（b）变性TPS。在混合过程中，加入0.5和1.0重量％的两种增容剂体系（a）和（b）。相比之下，添加基于TPS的增容剂可改善TPS在聚酯基质中的掺入，伴随着更高的拉伸强度和抗撕裂性。该观察结果的解释可能是预塑化淀粉提供了更大的反应表面，并在混合过程中实现了更好的均质化。相反，对于天然淀粉，该反应只能在颗粒表面发生，因此相容性效率较低。这项研究的结果是一种具有高生物基含量的可堆肥薄膜材料，对于一次性轻量包装应用具有巨大的潜力。对于天然淀粉，反应只能在颗粒表面进行，因此增容效率较低。这项研究的结果是一种具有高生物基含量的可堆肥薄膜材料，对于一次性轻量包装应用具有巨大的潜力。对于天然淀粉，反应只能在颗粒表面进行，因此增容效率较低。这项研究的结果是一种具有高生物基含量的可堆肥薄膜材料，对于一次性轻量包装应用具有巨大的潜力。