A strong, tough and cost-effective biodegradable PBAT/lignin composite film via intrinsic multiple noncovalent interactions,Green Chemistry

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A strong, tough and cost-effective biodegradable PBAT/lignin composite film via intrinsic multiple noncovalent interactions
Green Chemistry ( IF 9.3 ) Pub Date : 2023-03-17 , DOI: 10.1039/d2gc04929e
Shao-Jun Xiong ₁ , Si-Jie Zhou ₁ , Hao-Hui Wang ₁ , Han-Min Wang ₂ , Xiao-Jun Shen ₁ , Shixin Yu ₁ , Hui Li ₃ , Lu Zheng ₄ , Jia-Long Wen ₁ , Tong-Qi Yuan ₁ , Run-Cang Sun ₅

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Blending lignin with industrial degradable polyester is a sustainable and economically competitive strategy for biodegradable plastic production, but the miscibility of the composite remains a great challenge. In this study, the screened lignin with low molecular weight, uniform structure and rich hydroxyl groups was completely miscible with poly(butylene adipate-co-terephthalate) (PBAT). The low molecular weight of ethyl acetate dissolved lignin (EL) was critical for decreasing its glass transition temperature and steric hindrance, and the abundance of functional groups offered plenty of sites for forming strong intermolecular interactions between EL and PBAT. The intermolecular hydrogen bonds and π–π interactions of EL and PBAT promoted the dissociation of the lignin complex, thereby enhancing the plasticizing effect of PBAT on lignin. The PBAT/EL composite film with 50 wt% EL loading (P/EL₅₀) displayed high tensile strength (24.7 MPa) and elongation at break (494.7%), being ahead of the currently reported PBAT composite films with high lignin addition. The yield strength increased threefold due to the rigid lignin structure and the intrinsic multiple noncovalent interactions. Moreover, compared to pure PBAT films, P/EL₅₀ films exhibited a higher sensitivity of the mechanical performance to temperature and had a 22.9% cost reduction.

中文翻译：

通过内在多重非共价相互作用形成坚固、坚韧且具有成本效益的可生物降解 PBAT/木质素复合膜

将木质素与工业可降解聚酯混合是可生物降解塑料生产的可持续且具有经济竞争力的策略，但复合材料的混溶性仍然是一个巨大的挑战。在这项研究中，筛选出的低分子量、结构均匀且富含羟基的木质素与聚（己二酸丁二醇酯-共-对苯二甲酸丁二醇酯）（PBAT）完全混溶。乙酸乙酯溶解的木质素 (EL) 的低分子量对于降低其玻璃化转变温度和空间位阻至关重要，并且丰富的官能团为在 EL 和 PBAT 之间形成强分子间相互作用提供了大量位点。EL和PBAT的分子间氢键和π-π相互作用促进了木质素复合物的解离，从而增强了PBAT对木质素的增塑作用。₅₀ ) 显示出高拉伸强度 (24.7 MPa) 和断裂伸长率 (494.7%)，领先于目前报道的高木质素添加量的 PBAT 复合薄膜。由于刚性木质素结构和固有的多重非共价相互作用，屈服强度增加了三倍。此外，与纯 PBAT 薄膜相比，P/EL₅₀薄膜表现出更高的机械性能对温度的敏感性，成本降低了 22.9%。

更新日期：2023-03-17

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