Although the research on self-healing waterborne polyurethane has been relatively in-depth, accomplishing rapid self-healing at room temperature along with superior mechanical properties remains a substantial challenge. Herein, a three cross-linking waterborne polyurethane (TeWPU–Zn-x) with triple dynamic bonds was prepared by adding ditellurium glycol, isophorone diamine, and trimethylolpropane to the backbone of the waterborne polyurethane, forming coordination bonds between carboxyl groups on the backbone of the waterborne polyurethane and zinc ions. Owing to the cooperative action of three distinct types of cross-linking and triple dynamic bonds, the film of TeWPU–Zn-3 exhibits outstanding mechanical features (the tensile strength, 40.58 MPa; the fracture toughness, 20.75 MJ m2; the elongation at break, 629.15 %) and a remarkable self-healing efficiency (89.43 % under a trace amount of ethanol induction and visible light irradiation at room temperature for a duration of 2 h) simultaneously, demonstrating an exceptional balance between mechanical robustness and rapid room temperature self-healing, whose two characteristics outperforms those of the self-healing waterborne polyurethane reported so far. After reprocessing, the TeWPU–Zn-3 film cut into particles is basically restored to its original state and the reprocessing film can easily weigh 5 kg dumbbells. Moreover, due to the incorporation of zinc ions and ditellurium bonds, TeWPU–Zn-3 film is endowed with good antibacterial properties (S. aureus, 99.3 %; E. coli, 97.5 %). Importantly, when used as leather coating, TeWPU–Zn-3 also shows a protective self-healing ability on the leather. In summary, this work provides a promising avenue for the creation of waterborne polyurethane distinguished by their superior mechanical attributes, rapid room temperature self-healing, reprocess ability, and antibacterial properties.

中文翻译：

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机械强度高、室温快速自修复水性聚氨酯，具有基于三重动态键的三个交联网络


尽管对自修复水性聚氨酯的研究相对较深入，但在室温下实现快速自修复以及卓越的机械性能仍然是一项重大挑战。在此，通过在水性聚氨酯的主链中加入二碲二醇、异佛尔酮二胺和三羟甲基丙烷，制备了具有三重动态键的三交联水性聚氨酯 （TeWPU-Zn-x），在水性聚氨酯主链上的羧基与锌离子之间形成配位键。由于三种不同类型的交联键和三重动态键的协同作用，TeWPU-Zn-3 薄膜表现出优异的力学特性（拉伸强度 40.58 MPa;断裂韧性 20.75 MJ m2;断裂伸长率 629.15 %）和显著的自修复效率（在痕量乙醇诱导和可见光照射下，室温下持续 2 h 下为 89.43 %）， 展示了机械强度和快速室温自修复之间的特殊平衡，其两个特性优于迄今为止报道的自修复水性聚氨酯。经过再处理，切成颗粒的 TeWPU-Zn-3 薄膜基本恢复到原来的状态，再加工薄膜可以轻松达到 5 kg 的哑铃重量。此外，由于锌离子和二碲键的掺入，TeWPU-Zn-3 薄膜具有良好的抗菌性能（金黄色葡萄球菌，99.3 %;大肠杆菌，97.5 %）。重要的是，当用作皮革涂层时，TeWPU-Zn-3 还在皮革上显示出保护性自愈能力。 综上所述，这项工作为水性聚氨酯的创造提供了一条有前途的途径，其特点是其优异的机械性能、快速的室温自愈性、再加工能力和抗菌性能。