Abstract：
With the increased environmental issues, advanced high-performance and multifunctional polymeric materials derived from biomass have tremendous attention due to the great potential to replace their traditional petroleum-based counterparts. In this work, a series of lignin graft copolymers, lignin-graft-poly(n-butyl acrylate-co-acrylic acid) (Lig-g-P(BA-co-AA)), were rationally prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization. These lignin-based copolymers demonstrate good thermal stability and tunable glass transition temperature (Tg) values. The mechanical performance, including tensile strength, extensibility, Young\'s modulus, and toughness can be facilely adjusted by the BA/AA feed ratio and lignin content during polymerization. Owing to the extraordinary photothermal conversion ability of lignin, the Lig-B550 copolymer, containing 11.8 wt% lignin content, shows excellent stimulus-healing behavior within 1 min with a 97.1 % healing efficiency under near-infrared (NIR) laser irradiation. Moreover, the Lig-g-P(BA-co-AA) copolymers exhibit remarkable adhesion property, broadening their potential applications in the adhesive area. This grafting strategy is versatile and efficient, conferring the resultant lignin-based composite elastomers with dramatically enhanced mechanical properties and unprecedented photothermal behavior, which can inspire the further development of strong lignin-based sustainable elastomers.
摘要：
随着环境问题的增加，由生物质衍生的先进的高性能和多功能聚合物材料由于具有替代传统石油基材料的巨大潜力而受到极大的关注。在这项工作中,一系列木质素接枝共聚物，木质素-接枝-聚（丙烯酸正丁酯-共-丙烯酸）（Lig-g-P（BA-co-AA）），通过可逆加成-断裂链转移(RAFT)聚合合理制备。这些木质素基共聚物表现出良好的热稳定性和可调的玻璃化转变温度(Tg)值。机械性能,包括抗拉强度，可扩展性，杨氏模量,通过聚合过程中的BA/AA进料比和木质素含量可以很容易地调节韧性。由于木质素具有非凡的光热转化能力，Lig-B550共聚物，含有11.8重量%的木质素含量，在近红外（NIR）激光照射下，在1分钟内显示出优异的刺激愈合行为，愈合效率为97.1％。此外，Lig-g-P(BA-co-AA)共聚物表现出显著的粘合性能,扩大其在粘合剂领域的潜在应用。这种嫁接策略是通用和有效的，使所得的木质素基复合弹性体具有显着增强的机械性能和前所未有的光热行为，这可以激发强木质素基可持续弹性体的进一步发展。
