Polybutylene adipate terephthalate (PBAT) is a biodegradable polymer with promising properties, but its wide-spread application is limited by factors such as high cost, suboptimal mechanical characteristics, and slow biodegradation rate. In this study, these limitations are addressed by incorporating low-cost lignin, modified with an isocyanate compound, into PBAT via an extrusion process. By investigating the effects of varying isocyanate content on the lignin surface, the optimal modification conditions at room temperature are identified over 48 h. Additionally, the maximum lignin content (5 wt%) is determined within the composite to achieve a balance between mechanical, thermal, and biodegradation properties while also considering the economic and environmental feasibility of the polymer composite. The research delved into the examination of both the minimum selling price (MSP) and global warming potential (GWP) for all PBAT-mLigA composites. The optimized PBAT-mLigA composites exhibited a notable reduction of up to 7% in both MSP and GWP when compared to pure PBAT. The predominant determinants influencing the economic and environmental potentials of these composites are the pricing of PBAT and the ratio in which it is incorporated into the proposed composites.

中文翻译：

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基于聚己二酸对苯二甲酸丁二醇酯和改性木质素的高性能、经济的可生物降解复合材料

聚己二酸对苯二甲酸丁二醇酯（PBAT）是一种具有良好性能的可生物降解聚合物，但其广泛应用受到成本高、机械性能欠佳和生物降解速率慢等因素的限制。在本研究中，通过挤出工艺将经异氰酸酯化合物改性的低成本木质素掺入 PBAT 中，解决了这些限制。通过研究不同异氰酸酯含量对木质素表面的影响，在 48 小时内确定了室温下的最佳改性条件。此外，确定复合材料中的最大木质素含量（5 wt%），以实现机械、热和生物降解性能之间的平衡，同时还考虑聚合物复合材料的经济和环境可行性。该研究深入研究了所有 PBAT-mLigA 复合材料的最低销售价格 (MSP) 和全球变暖潜势 (GWP)。与纯 PBAT 相比，优化的 PBAT-mLigA 复合材料的 MSP 和 GWP 显着降低了 7%。影响这些复合材料的经济和环境潜力的主要决定因素是 PBAT 的定价及其纳入拟议复合材料的比例。