Inspired by marine mussels, dopamine with a catechol structure was self-polymerized in a weak alkaline environment and deposited on the surface of wood fiber (WF) to enhance the interface between WF and polylactic acid (PLA). At the same time, silver nanoparticles (Ag NPs) were attached to the surface of WF under the reducibility of polydopamine (PDA), giving the composite antibacterial activity against Aspergillus niger. The results showed that PDA and Ag NPs were successfully generated and attached to the WF surface. The thermal stability of WF was improved after the modification, which the maximum decomposition rate temperature of WF/PDA/Ag was increased by 29.2 °C compared with WF. According to relevant analysis, the tensile properties of WF/PDA-PLA were significantly improved. Compared with PLA, the tensile strength and Young's modulus of WF/PDA-PLA were increased by 8.13% and 52.89%. The bacteriostatic circle method measurement showed WF/PDA/Ag-PLA had a particular antibacterial ability for Aspergillus niger.

中文翻译：

受海洋贻贝的启发，具有邻苯二酚结构的多巴胺在弱碱性环境中自聚合并沉积在木纤维（WF）表面，以增强WF与聚乳酸（PLA）之间的界面。同时，在聚多巴胺（PDA）的还原作用下，银纳米粒子（Ag NPs）附着在WF表面，赋予了对黑曲霉的复合抗菌活性。. 结果表明，PDA 和 Ag NPs 成功生成并附着在 WF 表面。改性后WF的热稳定性得到改善，WF/PDA/Ag的最大分解速率温度比WF提高了29.2 ℃。据相关分析，WF/PDA-PLA的拉伸性能得到显着改善。与PLA相比，WF/PDA-PLA的抗拉强度和杨氏模量分别提高了8.13%和52.89%。抑菌圈法测定表明WF/PDA/Ag-PLA对黑曲霉具有特殊的抑菌能力。