The rheological behaviors, aging properties, and thermal stability of chain extended poly(butylene adipate-co-terephthalate)

IF 2.2 4区工程技术 Q2 MECHANICS

Korea-Australia Rheology Journal Pub Date : 2024-08-02 DOI:10.1007/s13367-024-00101-5

Yanping Hao, Leilei Chen, Fan Wang, Qingkui Chen, Shuangli Li, Weiwei Zhang, Shengnan Zhang, Hongchi Tian, Huili Yang

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Abstract

In this work, a one-step reactive extrusion method was adopted to improve comprehensive properties of poly(butylene adipate-co-terephthalate) (PBAT) by melt blending with two chain extenders, including polycarbodiimide (PCDI) and multi-functional epoxy polymer (ADR). Their influences on rheological behaviors, aging properties, and thermal stability of PBAT were explored, and the detailed mechanisms were also discussed. It was found that the terminal carboxyl content of PBAT decreased with addition of PCDI and ADR. When 1.0 wt% PCDI was added, the terminal carboxyl content deceased by 70.3%. This indicated that the reaction between the two chain extenders and the terminal hydroxyl and carboxyl groups of PBAT enhanced to perform the chain extension, which increased the molecular weight, storage modulus, loss modulus, and complex viscosity of PBAT, and different relaxation processes were observed for different samples by Han and Cole–Cole plots. Damp-heat aging resistance measurements showed correlation with terminal carboxyl content in PBAT. And reducing the terminal carboxyl content in PBAT was shown to increase hydrolytic stability. For PBAT with 1.0 wt% PCDI blend, the tensile strength and elongation at break retention were above 70%. In addition, the thermal stability of PBAT was also improved due to the chain extension in the blends, which retarded degradation. The analysis results indicated that the comprehensive performance of modified PBAT was the best when 1.0 wt% PCDI was added.

Graphical abstract

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链延聚（己二酸丁二醇酯-共对苯二甲酸丁二酯）的流变行为、老化特性和热稳定性

本研究采用一步反应挤出法，通过与聚碳二亚胺（PCDI）和多功能环氧聚合物（ADR）等两种扩链剂熔融共混，改善了聚（己二酸丁二醇酯-对苯二甲酸丁二酯）（PBAT）的综合性能。研究探讨了它们对 PBAT 的流变行为、老化性能和热稳定性的影响，并讨论了其中的详细机理。研究发现，PBAT 的末端羧基含量随着 PCDI 和 ADR 的添加而降低。当加入 1.0 wt% 的 PCDI 时，末端羧基含量减少了 70.3%。这表明两种扩链剂与 PBAT 的末端羟基和羧基之间的反应增强了扩链效果，从而增加了 PBAT 的分子量、储存模量、损失模量和复合粘度，而且通过 Han 和 Cole-Cole 图可以观察到不同样品的不同弛豫过程。耐湿热老化性测量结果显示与 PBAT 中的末端羧基含量有关。降低 PBAT 中的末端羧基含量可提高水解稳定性。对于含有 1.0 wt% PCDI 混合物的 PBAT，其拉伸强度和断裂伸长率保持在 70% 以上。此外，由于共混物中的链延伸，PBAT 的热稳定性也得到了改善，从而延缓了降解。分析结果表明，添加 1.0 wt% PCDI 时，改性 PBAT 的综合性能最佳。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Korea-Australia Rheology Journal 工程技术-高分子科学

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The Korea-Australia Rheology Journal is devoted to fundamental and applied research with immediate or potential value in rheology, covering the science of the deformation and flow of materials. Emphases are placed on experimental and numerical advances in the areas of complex fluids. The journal offers insight into characterization and understanding of technologically important materials with a wide range of practical applications.