The preparation of dynamic networks from lignin with multipurpose and multifunctional practical applications is highly desirable but still challenging. In this study, the combination of a “grafting from” reversible addition-fragmentation chain transfer (RAFT) polymerization and dynamic chemistry was utilized to synthesize lignin based dynamic networks. Vanillin, a derived chemical from lignin, was used as a building block to realize the structural reorganization of lignin via RAFT polymerization, together with fatty acid derivative as the comonomer. NMR analysis confirmed the expected structures. It was demonstrated that the physicochemical properties of grafted lignin were adjustable depending on polymerization reaction conditions. Due to the presence of aldehyde groups from vanillin moiety, a dynamic network was produced by using diamines as crosslinkers. The mechanical properties were also tunable via controlling the structure of crosslinkers. The crosslinked lignin-based dynamic networks exhibited various interesting properties, such as recyclability and UV-adsorption ability. In addition, it could be used as self-healing, antifungal and conductive adhesives. The shear strength after first time self-healing could reach 2.9 MPa, which was 83.1% of the pristine adhesion. This damage and repair process could be carried out at least four times under relatively low temperature (80 ^oC) and pressure (1.0 MPa). More importantly, antifungal activity was observed for the self-healing adhesive, which might enlarge its applications. Additionally, after the addition of carbon nanotubes, the generated conductive adhesive was weldable without compromising its conductivity. This study has demonstrated the potential of lignin to synthesize high value-added materials, which could be appealing to both biorefinery and materials society.

由木质素制备具有多种用途和多功能实际应用的动态网络是非常需要的，但仍具有挑战性。在这项研究中，可逆加成-断裂链转移（RAFT）聚合与动态化学的结合被用来合成基于木质素的动态网络。香兰素，从木质素衍生的化学，被用来作为一个积木实现木质素的结构重组经由RAFT聚合，连同脂肪酸衍生物作为共聚单体。NMR分析证实了预期的结构。结果表明，接枝木质素的理化性质可根据聚合反应条件进行调节。由于香草醛部分存在醛基，通过使用二胺作为交联剂产生了动态网络。机械性能也可以通过控制交联剂的结构。交联的基于木质素的动态网络表现出各种有趣的特性，例如可回收性和紫外线吸收能力。此外，它还可以用作自修复，抗真菌和导电粘合剂。首次自我修复后的剪切强度可达到2.9 MPa，是原始粘合力的83.1％。这种损坏和修复过程可以在相对较低的温度下（80 ^oC）和压力（1.0 MPa）。更重要的是，对于自修复胶粘剂观察到了抗真菌活性，这可能会扩大其应用范围。另外，在添加碳纳米管之后，所产生的导电粘合剂可焊接而不损害其导电性。这项研究证明了木质素合成高附加值材料的潜力，这可能对生物炼制和材料社会都具有吸引力。