Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, P. R. China.
Soft Matter. 2017 Apr 5;13(14):2654-2662. doi: 10.1039/c7sm00125h.
We developed tough, rapid-recovery composite hydrogels that are fabricated via core-shell microgel covalent bonding and Fe dynamic metal coordination cross-linking. First, core-shell microgels are used as cross-linking agents and initiators to prepare homogeneous hydrogel networks with rapid recovery in the absence of an organic cross-linking agent. The toughness and recoverability of the composite hydrogels can be improved by adding the dynamic reversibility of ionic cross-linking. Owing to the synergistic effect of microgel covalent bonding, Fe coordination cross-linking, and H-bond cross-linking, the multi-cross-linked composite hydrogels exhibit excellent toughness and a fast recovery rate. These characteristics demonstrate that the dynamic reversibility of the ionic cross-linking can significantly improve the toughness and recoverability of the hydrogels. In addition, the core-shell microgels play a key role in toughening the hydrogels and accelerating their recovery by transferring stress to grafted polymer chains and homogenizing the hydrogel network.
我们开发了一种坚韧、快速恢复的复合水凝胶，它是通过核壳微凝胶共价键合和 Fe 动态金属配位交联制备的。首先，核壳微凝胶被用作交联剂和引发剂，在没有有机交联剂的情况下制备具有快速恢复能力的均匀水凝胶网络。通过添加离子交联的动态可逆性，可以提高复合水凝胶的韧性和可恢复性。由于微凝胶共价键合、Fe 配位交联和氢键交联的协同作用，多交联复合水凝胶表现出优异的韧性和快速恢复率。这些特性表明离子交联的动态可逆性可以显著提高水凝胶的韧性和可恢复性。此外，核壳微凝胶通过将应力转移到接枝聚合物链和均匀化水凝胶网络，在增强水凝胶的韧性和加速其恢复方面发挥着关键作用。
