Tunable, UV-shielding and biodegradable composites based on well-characterized lignins and poly(butylene adipate-co-terephthalate),Green Chemistry

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Tunable, UV-shielding and biodegradable composites based on well-characterized lignins and poly(butylene adipate-co-terephthalate)
Green Chemistry ( IF 9.3 ) Pub Date : 2020-11-19 , DOI: 10.1039/d0gc03284k
Han-Min Wang _{1,

2,

3,

4} , Bin Wang _{1,

2,

3,

4} , Tong-Qi Yuan _{1,

2,

3,

4} , Lu Zheng _{4,

5,

6,

7} , Quentin Shi _{4,

5,

6,

7} , Shuang-Fei Wang _{4,

8,

9,

10} , Guo-Yong Song _{1,

2,

3,

4} , Run-Cang Sun _{4,

11,

12,

13}

Affiliation

Biodegradable materials are increasingly imperative in modern society owing to their eco-friendly character, but their high cost and limited properties restrict their applications. In this study, lignin-based (30–50 wt%) biodegradable composites with superior performances were successfully prepared by incorporating lignin into the poly(butylene adipate-co-terephthalate) (PBAT) matrix. In order to improve the compatibility, lignin was efficiently modified by a green esterification reaction under microwave-assisted solvent-free conditions. Comprehensive characterization revealed that modified lignin had fewer inter-unit linkages, increased molecular weights, lower T_g and enhanced hydrophobicity. Moreover, the prepared modified lignin/PBAT composites reinforced with maleic anhydride (MAH) exhibited controllable improvements in mechanical properties and exhibited excellent UV-shielding properties, and their elongation at break, even with 40 wt% lignin, increased by 500% compared to that of unmodified counterparts. The ideal dispersion and compatibility of the modified lignin in the matrix facilitated the mechanical properties of composites, as revealed by morphological and thermal analysis. Importantly, molecular dynamics (MD) simulation unprecedentedly confirmed that the modification of lignin distinctly strengthened molecular interaction and compatibility of the matrices, enhancing the mechanical performance of the composites. This work presents a green and feasible route to produce cost-efficient biodegradable materials with controlled mechanical and UV-shielding properties for packaging application.

中文翻译：

基于良好表征的木质素和聚（己二酸丁二酯-对苯二甲酸丁二酯）的可调谐，防紫外线和可生物降解的复合材料

由于其生态友好特性，可生物降解材料在现代社会中变得越来越重要，但是它们的高成本和有限的性能限制了它们的应用。在这项研究中，通过将木质素到聚（亚丁基己二酸酯成功制备木质素基（30-50重量％）具有优异的性能的可生物降解的复合材料共-terephthalate）（PBAT）矩阵。为了改善相容性，在微波辅助的无溶剂条件下，通过绿色酯化反应有效地改性了木质素。综合特征表明，改性木质素具有较少的单元间键合，增加的分子量，较低的T _g和增强的疏水性。此外，所制备的用马来酸酐（MAH）增强的改性木质素/ PBAT复合材料表现出可控的机械性能改善，并具有出色的紫外线屏蔽性能，即使木质素含量为40 wt％，其断裂伸长率也比后者提高了500％。未修改的对应对象。形态和热分析表明，改性木质素在基质中的理想分散性和相容性促进了复合材料的机械性能。重要的是，分子动力学（MD）模拟前所未有地证实了木质素的改性显着增强了基体的分子相互作用和相容性，从而增强了复合材料的机械性能。

更新日期：2020-11-19

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