Economically Competitive Biodegradable PBAT/Lignin Composites: Effect of Lignin Methylation and Compatibilizer
Economically Competitive Biodegradable PBAT/Lignin Composites: Effect of Lignin Methylation and Compatibilizer
复制标题
DOI：
10.1021/acssuschemeng.0c00789
复制
发表时间：
2020-04-06
影响因子：
8.4
通讯作者：
Sun, Run-Cang
中科院分区：
文献类型：
--
作者：
Xiong, Shao-Jun;Bo, Pang;Sun, Run-Cang
在过去的70年里，全球生产了80多亿吨塑料，其中大部分不能完全生物降解，导致其碎片遍布生物圈，包括生物体内。本文采用双螺杆挤出法，将聚己二酸丁二酯（PBAT）与工艺木质素共混制备了一组可生物降解的复合材料。为了改善PBAT/木质素复合材料的力学性能，提出了两种策略：(1)通过甲基化修饰木质素以减少-OH基团之间的氢键；(2)通过添加马来酸酐接枝PBAT作为相容剂增强PBAT与木质素之间的分子间相互作用。两种方法制备的木质素含量为60%的复合材料具有理想的拉伸性能，可以满足中国包装国家标准的要求。通过形貌和热分析研究了不同组分之间的相互作用。结果表明：当木质素作为填料加入复合材料时，木质素的分子迁移率及其团聚体的大小显著影响PBAT/木质素薄膜的延展性和机械强度。对PBAT纯膜和PBAT/木质素复合膜的成本进行简单的比较表明，PBAT/木质素复合膜具有经济竞争力，其生产成本可显著降低36%。
In the past 70 years, over 8 billion tons of plastics have been produced, the majority of which cannot be fully biodegraded, causing their fragments to be found everywhere in the biosphere, including living organisms. Herein, a group of biodegradable composites were produced by blending poly(butylene adipate-co-terephthalate) (PBAT) with technical lignin through a twin-screw extrusion method. Two strategies were developed to improve the mechanical properties of PBAT/lignin composites: (1) modifying lignin via methylation to reduce hydrogen bonding between -OH groups and (2) enhancing the intermolecular interactions between PBAT and lignin by adding maleic anhydride-graft-PBAT as a compatibilizer. The composites obtained from the two strategies with 60 wt % lignin contents exhibited ideal tensile performance which could meet the requirement of the Chinese National Standard for packaging. The interactions between different composite components were investigated by morphological and thermal analyses. The results showed that when lignin is used as filler in the composites, the molecular mobility of lignin and the size of its agglomerates remarkably impacted the ductility and mechanical strength of the PBAT/lignin films. A simple cost comparison between neat PBAT film and PBAT/lignin composite films indicated that the latter was economically competitive, and the production costs could significantly reduce by 36%.