儿茶酚
聚合物
自愈水凝胶
自愈
材料科学
氢键
金属
共价键
自愈材料
贻贝
纳米技术
高分子化学
化学工程
水溶液
化学
有机化学
复合材料
分子
冶金
医学
替代医学
病理
工程类
生态学
生物
作者
B. Kollbe Ahn,Dong Woog Lee,Jacob N. Israelachvili,J. Herbert Waite
出处
期刊:Nature Materials
[Springer Nature]
日期:2014-07-27
卷期号:13 (9): 867-872
被引量:394
摘要
Polymeric materials that intrinsically heal at damage sites under wet or moist conditions are urgently needed for biomedical and environmental applications. Although hydrogels with self-mending properties have been engineered by means of mussel-inspired metal-chelating catechol-functionalized polymer networks, biological self-healing in wet conditions, as occurs in self-assembled holdfast proteins in mussels and other marine organisms, is generally thought to involve more than reversible metal chelates. Here we demonstrate self-mending in metal-free water of synthetic polyacrylate and polymethacrylate materials that are surface-functionalized with mussel-inspired catechols. Wet self-mending of scission in these polymers is initiated and accelerated by hydrogen bonding between interfacial catechol moieties, and consolidated by the recruitment of other non-covalent interactions contributed by subsurface moieties. The repaired and pristine samples show similar mechanical properties, suggesting that the triggering of complete self-healing is enabled underwater by the formation of extensive catechol-mediated interfacial hydrogen bonds.
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