The effects of two different peroxides [di(tert-butylperoxyisopropyl) benzene (DTBP) and bis(tert-butyl dioxy isopropyl) benzene (BIBP)] and a co-agent such as [triallyl isocyanurate (TAIC)], singly and together, were studied through the rheological, mechanical and thermal properties of poly(butylene adipate-co-butylene terephthalate) (PBAT). It was found that a cross-linked PBAT with different gel fractions were obtained by adding small amounts of peroxides and a co-agent. Addition of the peroxides and the co-agent similarly induced bond breakage of PBAT chain during the melting extrusion, which produced high carboxyl end-groups contents. Moreover, cross-linked PBAT exhibited a remarkable improvement in modulus and complex viscosity due to the formation of a gel network. Furthermore, the elongation-at-break decreased with an increase in gel fraction, but the tensile strength was slightly affected. It was interesting that the cross-linked structures could act as nucleating agents which enhanced the crystallization of PBAT. In addition, the thermal stability of PBAT was improved due to the cross-linked structures in PBAT which retarded degradation. According to the above results, cross-linking could extend processing methods of PBAT, like foaming and film blowing. Therefore, the practical applications of PBAT could be widely expanded.

Graphical abstract

中文翻译：

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过氧化物交联及其对聚己二酸丁二醇酯-对苯二甲酸丁二醇酯流变学、机械和热性能的影响

两种不同的过氧化物[二(叔丁基过氧异丙基)苯(DTBP)和双(叔丁基二氧基异丙基)苯(BIBP)]和助剂例如[异氰脲酸三烯丙酯(TAIC)]单独和一起的效果，通过聚己二酸丁二醇酯的流变学、机械和热性能研究-对苯二甲酸丁二醇酯）（PBAT）。结果发现，通过添加少量过氧化物和助剂，可以获得具有不同凝胶分数的交联PBAT。过氧化物和助剂的添加同样会在熔融挤出过程中引起 PBAT 链的键断裂，从而产生高羧基端基含量。此外，由于凝胶网络的形成，交联的PBAT在模量和复数粘度方面表现出显着的改善。此外，断裂伸长率随着凝胶分数的增加而降低，但拉伸强度略有影响。有趣的是，交联结构可以充当成核剂，增强 PBAT 的结晶。此外，由于PBAT中的交联结构延缓了降解，PBAT的热稳定性得到改善。根据以上结果，交联可以扩展PBAT的加工方法，如发泡和吹膜。因此，PBAT的实际应用可以得到广泛扩展。

图形概要