College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P. R. China.
The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, P. R. China.
J Mater Chem B. 2022 Feb 16;10(7):1085-1093. doi: 10.1039/d1tb02710g.
To endow the polyurethane (PU) coating with antimicrobial and self-healing ability, a PU composite film (PUDA@Ag) based on furfuryl functional polydopamine nanoparticles (FPDA NPs) and Diels-Alder (DA) reaction was prepared successfully. Herein, FPDA NPs were added to maleimide-terminated PU by DA reaction as cross-linking agents and photothermal fillers. Owing to the excellent photothermal effect of PDA NPs and the existence of DA bonds, the PUDA@Ag film had superior self-healing performance (90%). Importantly, with the existence of FPDA@Ag, the PU composite films showed comprehensive mechanical properties (tensile strength up to 50 MPa, toughness of 153.9 MJ m, and elongation at break of 895%). Silver nanoparticles (AgNPs) as antibacterial agents and nanofillers endowed the PUDA@Ag with excellent antibacterial and long-term antibacterial properties against Gram-negative and Gram-positive . This work provides a reasonable method to prepare multi-responsive self-healing PU composite films with super-high strength and antimicrobial properties that have great potential in the fields of biomedicine, coating, and thermal management.
为了赋予聚氨酯（PU）涂层抗菌和自修复能力，成功制备了基于呋喃基功能化聚多巴胺纳米粒子（FPDA NPs）和 Diels-Alder（DA）反应的 PU 复合膜（PUDA@Ag）。在此，FPDA NPs 通过 DA 反应作为交联剂和光热填充剂添加到马来酰亚胺封端的 PU 中。由于 PDA NPs 的优异光热效应和 DA 键的存在，PUDA@Ag 薄膜具有优异的自修复性能（90%）。重要的是，由于存在 FPDA@Ag，PU 复合膜表现出综合力学性能（拉伸强度高达 50 MPa，韧性为 153.9 MJ m，断裂伸长率为 895%）。银纳米粒子（AgNPs）作为抗菌剂和纳米填料，赋予了 PUDA@Ag 优异的抗菌性能和对革兰氏阴性菌和革兰氏阳性菌的长期抗菌性能。这项工作为制备具有超高强度和抗菌性能的多响应自修复 PU 复合膜提供了一种合理的方法，在生物医学、涂层和热管理等领域具有巨大的应用潜力。
