Without the introduction of new functional groups, altering the properties of a substance, such as by changing from a non-self-healing to a rapidly self-healing material, is often difficult. In this work, we report that the properties of 2-hydroxyethyl methacrylate and acrylamide (HEMA/AAm) hydrogels can be easily altered from non-self-healing to rapidly self-healing by simply tuning the reaction temperature. Notably, the hydrogels that are prepared at room temperature do not exhibit self-healing behavior, while those treated at an elevated temperature show automatic self-healing performance within ~15 s. Interestingly, in contrast with the previous self-healing HEMA-based polymeric hydrogels, which function only above their glass transition temperatures (T_g), the hydrogels prepared herein exhibit rapid self-healing properties at room temperature, which is below their T_g. In addition, the stretching capabilities of the hydrogels can be greatly enhanced by up to 30-fold. The hydrogels also exhibit good adhesive performance and can adhere strongly onto various substrates, such as wood, glass, fabric, paper, leather, porcelain, and steel. For example, a 10 kg weight could be suspended from a wooden substrate with the aid of these hydrogels. These results may provide valuable insight regarding the design of self-healing hydrogels and their large-scale production.

如果不引入新的官能团，通常很难改变物质的性质，例如从非自我修复材料转变为快速自我修复材料。在这项工作中，我们报告说，只需调节反应温度，就可以轻松地将甲基丙烯酸2-羟乙酯和丙烯酰胺（HEMA / AAm）水凝胶的性质从非自修复变为快速自修复。值得注意的是，在室温下制备的水凝胶不表现出自愈性能，而在高温下处理的水凝胶在约15 s内表现出自动自愈性能。有趣的是，与以前的自修复HEMA基聚合物水凝胶相反，后者仅在其玻璃化转变温度（T _g），本文制得的水凝胶在室温下显示出快速的自修复性能，该温度低于其T _g。此外，水凝胶的拉伸能力可以大大提高多达30倍。水凝胶还表现出良好的粘合性能，可以牢固地粘附在各种基材上，例如木材，玻璃，织物，纸张，皮革，瓷器和钢。例如，借助这些水凝胶可以将10千克重的物质从木质基材上悬吊下来。这些结果可能为自修复水凝胶的设计及其大规模生产提供有价值的见解。