Abstract We herein present dual-network self-healing hydrogels via ionic cross-linking and hydrogel bonds based on chitosan molecular chain as a template. Chitosan and poly(acrylic acid) were reacted to form a dual-network structure via Fe3+ ion coordination and hydrogen bonds. The healing property mainly depends on the coordination between Fe3+ ions and COOH or NH2 groups of the polymer chains, as well as on the hydrogen bonds occurring among OH, NH2 and COOH groups. Compared with the covalent cross-linking points, the ionic linkages and hydrogen bonds in the hydrogels were stochastic and dynamic. Hence, if the hydrogel becomes cracked or possesses a notch, the cross-linking points will be destroyed, while the new ones will be re-formed based on the dual-network of the hydrogel. The self-healing efficiency of the as-prepared hydrogel could reach 98.5% when the concentration range of 0.01–0.5 M Fe3+ aqueous solution was used. In addition, both the compression resistance and electrical conductivity of the hydrogel were enhanced with FeCl3 content increasing. Therefore, the as-prepared hydrogel exhibited excellent stretchability, compression resistance, self-healing performance without any external stimulus, and electrical conductivity.

中文翻译：

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具有导电性能的双网络自修复水凝胶的模板法

摘要 我们在此提出了基于壳聚糖分子链作为模板的通过离子交联和水凝胶键的双网络自修复水凝胶。壳聚糖和聚（丙烯酸）通过 Fe3+ 离子配位和氢键反应形成双网络结构。愈合性能主要取决于 Fe3+ 离子与聚合物链的 COOH 或 NH2 基团之间的配位，以及 OH、NH2 和 COOH 基团之间的氢键。与共价交联点相比，水凝胶中的离子键和氢键是随机和动态的。因此，如果水凝胶破裂或出现缺口，交联点将被破坏，而新的交联点将基于水凝胶的双网络重新形成。当使用浓度范围为 0.01-0.5 M Fe3+ 的水溶液时，所制备的水凝胶的自修复效率可达 98.5%。此外，随着 FeCl3 含量的增加，水凝胶的抗压性和电导率都提高了。因此，所制备的水凝胶表现出优异的拉伸性、抗压性、无任何外部刺激的自愈性能和导电性。