We investigated poly(butylene adipate-co-terephthalate) (PBAT), a biodegradable polymer, under the influence of a chain extender (a multifunctional epoxide oligomer, Joncryl ADR-4370S^®, ADR) at different concentrations, and correlated their properties concerning the molecular interaction between the active sites of the structures. Several studies have used ADR in poly(lactic acid)-PBAT blends; however, the effect of ADR in terms of chemical and physical interaction with PBAT is not investigated in-depth, which can limit its applications. The chain extender is usually applied to improve the mechanical and thermal properties and PBAT resistance to thermal degradation. The developed materials were evaluated by high-resolution solid-state nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), mechanical and thermal properties, and rheological measurements. NMR and FTIR indicate an interaction between the carboxylic sites of PBAT and the epoxy sites of ADR. PBAT-2%ADR shows higher tensile properties, probably due to the hydrogen bonds and interactions of π–π nature between the materials; in this case, the ADR can act as a reinforcing agent. High contents of chain extender can change the nature of the interaction and influence the final properties of the polymer. The effect of this additive was found to be strongly dependent on the content used and the polymer processing. It was observed that ADR could act as an internal lubricant during processing (due to the low molecular weight of this additive), demonstrating the importance of processing parameters control.

中文翻译：

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了解扩链剂对聚己二酸丁二酯-对苯二甲酸对苯二甲酸酯结构的影响

我们研究了聚（亚丁基己二酸酯共-terephthalate）（PBAT），可生物降解的聚合物，扩链剂的影响下（一个多官能环氧化物低聚物，JONCRYL ADR-4370S ^®，ADR）在不同的浓度，并将它们的结构相关的活性位点之间的分子相互作用相关的属性。多项研究已在聚乳酸-PBAT混合物中使用了ADR。但是，ADR在与PBAT的化学和物理相互作用方面的作用尚未得到深入研究，这可能会限制其应用。扩链剂通常用于改善机械性能和热性能以及PBAT对热降解的抵抗力。通过高分辨率固态核磁共振（NMR），傅立叶变换红外光谱（FTIR），机械和热性能以及流变学测量对开发的材料进行了评估。NMR和FTIR表明PBAT的羧基和ADR的环氧位之间存在相互作用。PBAT-2％ADR表现出更高的拉伸性能，可能是由于氢键以及材料之间π–π性质的相互作用所致；在这种情况下，ADR可以充当增强剂。高含量的扩链剂会改变相互作用的性质并影响聚合物的最终性能。发现该添加剂的作用强烈地取决于所使用的含量和聚合物加工。据观察，ADR可以在加工过程中充当内部润滑剂（由于该添加剂的低分子量），这证明了加工参数控制的重要性。发现该添加剂的作用强烈地取决于所使用的含量和聚合物加工。据观察，ADR可以在加工过程中充当内部润滑剂（由于该添加剂的低分子量），这证明了加工参数控制的重要性。发现该添加剂的作用强烈地取决于所使用的含量和聚合物加工。据观察，ADR可以在加工过程中充当内部润滑剂（由于该添加剂的低分子量），这证明了加工参数控制的重要性。