In this study, a supramolecular hydrogel formed by incorporating the 2,6-bis(1,2,3-triazol-4-yl)-pyridine (btp) ligand in the backbone of a polymer prepared by copper(I)-catalyzed alkyne-azide cycloaddition (CuAAC) "click" polyaddition reaction of 2,6-diethynylpyridine and diazido-poly(ethylene glycol) is reported. The hydrogelation is selectively triggered by the addition of Ni2+ ions to aqueous copolymer solutions. The gelation and rheological properties could be tuned by the change of metal to ligand ratio and polymer concentration. Interestingly, the hydrogel exhibits a fast (within 2 min) and excellent repeatable autonomic healing capacity without external stimuli. This self-healing behavior may find potential applications for the repairing of metal coatings, in the future.

中文翻译：

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基于聚乙二醇与主链中双三唑吡啶配体的特定Ni2 +配位相互作用的自修复金属超分子水凝胶。

在这项研究中，通过在铜（I）催化炔烃制备的聚合物主链中掺入2,6-双（1,2,3-三唑-4-基）-吡啶（btp）配体形成的超分子水凝胶报道了2，6-二乙炔基吡啶与二叠氮基-聚（乙二醇）的-叠氮化物环加成（CuAAC）“点击”加成反应。通过将Ni 2+离子添加到共聚物水溶液中来选择性地引发水凝胶化。可以通过改变金属与配体的比例和聚合物浓度来调节凝胶化和流变性。有趣的是，水凝胶在没有外部刺激的情况下表现出快速的（2分钟内）和出色的可重复的自主神经愈合能力。这种自我修复行为可能会在将来发现修补金属涂层的潜在应用。