This paper investigates the effect of the incorporation of chain extender on the poly(butylene adipate-co-terephthalate) (PBAT) and their mixture with calcium carbonate (CaCO3) composites. Chain extender (ADR) was used to enhance the compatibility between PBAT and CaCO3, which have poor interfacial adhesion. Mechanical, thermal, and morphological properties of PBAT, PBAT/chain extender, and their composites were studied. The incorporation of the chain extender enhanced Young’s modulus and elongation at break of the neat PBAT, which is an indicator of the interaction between both materials. These results were confirmed by 1H NMR and 13C NMR (proton – hydrogen and carbon nuclear magnetic resonance, respectively). The chain extender acted by dispersing the CaCO3 particles; however, with an increase in the filler content, there is a decrease in the mechanical properties. Thermogravimetric analysis showed that chain extender has no influence on neat PBAT thermal behavior and their composites containing CaCO3. Differential scanning calorimetric analysis showed a decrease in crystallinity values of the PBAT and its composites, which is due to the physical impediment in the organization of polymer chains. Photomicrographs, obtained by scanning electron microscopy, showed that chain extender does not influence PBAT morphology. However, in the composites, chain extender enhanced the dispersion on CaCO3 particles.

中文翻译：

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使用增链剂作为 CaCO3 在 PBAT 基质中的分散剂

本文研究了扩链剂的加入对聚（己二酸丁二醇酯-对苯二甲酸酯）（PBAT）及其与碳酸钙（CaCO3）复合材料的混合物的影响。扩链剂（ADR）用于增强 PBAT 和 CaCO3 之间的相容性，它们的界面粘附性较差。研究了 PBAT、PBAT/扩链剂及其复合材料的机械、热和形态特性。扩链剂的加入提高了纯 PBAT 的杨氏模量和断裂伸长率，这是两种材料之间相互作用的指标。这些结果由 1H NMR 和 13C NMR（分别为质子-氢和碳核磁共振）证实。扩链剂的作用是分散 CaCO3 颗粒；然而，随着填料含量的增加，机械性能下降。热重分析表明扩链剂对纯 PBAT 热行为及其含有 CaCO3 的复合材料没有影响。差示扫描量热分析显示 PBAT 及其复合材料的结晶度值降低，这是由于聚合物链组织中的物理障碍。通过扫描电子显微镜获得的显微照片显示增链剂不影响 PBAT 形态。然而，在复合材料中，扩链剂增强了在 CaCO3 颗粒上的分散。差示扫描量热分析显示 PBAT 及其复合材料的结晶度值降低，这是由于聚合物链组织中的物理障碍。通过扫描电子显微镜获得的显微照片显示增链剂不影响 PBAT 形态。然而，在复合材料中，扩链剂增强了在 CaCO3 颗粒上的分散。差示扫描量热分析显示 PBAT 及其复合材料的结晶度值降低，这是由于聚合物链组织中的物理障碍。通过扫描电子显微镜获得的显微照片显示增链剂不影响 PBAT 形态。然而，在复合材料中，扩链剂增强了在 CaCO3 颗粒上的分散。