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Issue 14, 2017
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Tough, rapid-recovery composite hydrogels fabricated via synergistic core–shell microgel covalent bonding and Fe3+ coordination cross-linking

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Abstract

We developed tough, rapid-recovery composite hydrogels that are fabricated via core–shell microgel covalent bonding and Fe3+ 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, Fe3+ 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.

Graphical abstract: Tough, rapid-recovery composite hydrogels fabricated via synergistic core–shell microgel covalent bonding and Fe3+ coordination cross-linking

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Article information


Submitted
18 Jan 2017
Accepted
10 Mar 2017
First published
14 Mar 2017

Soft Matter, 2017,13, 2654-2662
Article type
Paper

Tough, rapid-recovery composite hydrogels fabricated via synergistic core–shell microgel covalent bonding and Fe3+ coordination cross-linking

X. Liang, Y. Deng, X. Pei, K. Zhai, K. Xu, Y. Tan, X. Gong and P. Wang, Soft Matter, 2017, 13, 2654
DOI: 10.1039/C7SM00125H

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