Polyvinyl alcohol and acidity‐regulating KH2PO4 synergistically accelerated degradation of PBAT/PLA composites,Journal of Applied Polymer Science

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Polyvinyl alcohol and acidity‐regulating KH2PO4 synergistically accelerated degradation of PBAT/PLA composites
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-11-22 , DOI: 10.1002/app.50301
Hailu Liu _{1,

2} , Huayan Shen _{1,

2} , Fayong Li _{1,

2} , Dong Xie _{1,

2} , Junjia Chen _{1,

2}

Affiliation

Poly(butylene adipate‐co‐terephthalate) (PBAT)/polylactic acid (PLA) composites were prepared by water‐soluble polyvinyl alcohol (PVA) and degradation‐promoting agent (DPA) which were made from acidity‐regulating KH₂PO₄ and halloysite by a physical layer‐by‐layer coating method. The effect of PVA and DPA on the biodegradation of PBAT/PLA composites in the cross‐sectional morphology, thermal properties, molecular structure, due to degradation was evaluated using a host of characterization methods. The results showed that PVA had a good solubilizing effect on the composite system and improved the overall compatibility. DPA had little effect on the compatibility, crystallinity, and thermal stability of the composite system, but greatly accelerated the degradation. The interior of composite material containing DPA (Com‐DPA) was shown to be severely damaged after 29 weeks of degradation, which was attributed to preferential degradation of amorphous regions of the composite by ester hydrolysis. Our results demonstrated the PVA and DPA worked synergistically to promote swelling and diffusivity of degradation products, and provided an acid environment for enhancing ester hydrolysis. This technology may have good prospects for accelerated degradation of materials in agricultural applications.

中文翻译：

聚乙烯醇和调节酸度的KH2PO4协同加速PBAT / PLA复合材料的降解

聚己二酸丁二酯-对苯二甲酸丁二醇酯（PBAT）/聚乳酸（PLA）复合材料是由水溶性聚乙烯醇（PVA）和降解促进剂（DPA）制成的，它们是由调节酸度的KH ₂ PO ₄制成的和埃洛石通过物理逐层涂覆方法。使用多种表征方法评估了PVA和DPA对PBAT / PLA复合材料在降解过程中的截面形态，热性能，分子结构的生物降解的影响。结果表明，PVA对复合体系具有良好的增溶作用，提高了整体相容性。DPA对复合体系的相容性，结晶度和热稳定性几乎没有影响，但大大加速了降解。含有DPA（Com-DPA）的复合材料的内部在降解29周后被严重破坏，这归因于酯水解使复合材料的非晶区优先降解。我们的结果表明，PVA和DPA协同作用以促进降解产物的溶胀和扩散，并为增强酯水解提供了酸性环境。这项技术可能具有加速农业应用中材料降解的前景。

更新日期：2020-11-22

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