Hydrogels based on borate ester bonds enable fast, multiple repairs with their dynamically reversible covalent bonds at room temperature. However, these materials could only be healed with alkaline additives to control the pH values right now which results in the limited healing and mechanical performance. In this research, dimethylaminoethyl methacrylate (DMAEMA) is employed as an alkaline monomer and randomly copolymerize with N-methylol acrylamide (NAM) to form a mechanical enhanced and self-healing hydrogel at room temperature. The hydrogels exhibit a dramatic fracture stress of as much as 368 kPa and fracture strain of 542%. Besides, the anti-fatigue properties of the hydrogels (slight residual deformation after stretch-release cycles at strain of 200%) have been proved as well. Moreover, the as-prepared hydrogels successfully achieve 91% of the fracture stress recovery within 1 h at room temperature and 100% repair of the fracture strain after 24 h. At last, the healing mechanism has been discussed. This work provides a novel system for the borate ester bonds-based self-healing materials with improved healing and mechanical performance by the simple and efficient method which would expand the range of applications in smart materials.

基于硼酸酯键的水凝胶可在室温下通过其动态可逆的共价键进行快速，多次修复。但是，这些材料现在只能用碱性添加剂进行修复，以控制pH值，这导致有限的愈合和机械性能。在这项研究中，甲基丙烯酸二甲氨基乙酯（DMAEMA）被用作碱性单体并与N无规共聚。-羟甲基丙烯酰胺（NAM）在室温下形成机械增强的自修复水凝胶。水凝胶表现出高达368 kPa的剧烈断裂应力和542％的断裂应变。此外，还证明了水凝胶的抗疲劳特性（拉伸释放循环后在200％应变下有轻微残留变形）。此外，所制备的水凝胶在室温下1小时内成功达到91％的断裂应力恢复，并在24小时后成功实现100％的断裂应变修复。最后，讨论了其愈合机理。这项工作通过简单有效的方法为基于硼酸酯键的自修复材料提供了一种新颖的系统，该系统具有改善的愈合和机械性能，这将扩大在智能材料中的应用范围。