Ultra-robust Metallosupramolecular Hydrogels with Unprecedented Self-recoverability using Asymmetrically Distributed Carboxyl-Fe3+Coordination Interactions  

作　　者：Zhao-Yang Yuan Zhen-Xing Cao Rui Wu Hui Li Qiong-Jun Xu Hai-Tao Wu Jing Zheng Jin-Rong Wu 

机构地区：[1]State Key Laboratory of Polymer Materials Engineering,College of Polymer Science and Engineering,Sichuan University,Chengdu,610065,China

出　　处：《Chinese Journal of Polymer Science》2023年第2期250-257,共8页高分子科学（英文版）

基　　金：National Natural Science Foundation of China(No.51873110).

摘　　要：Recently,numerous mechanically robust synthetic hydrogels have been created.However,unlike natural loading-bearing materials such as cartilages and muscles,most hydrogels have inherently contradictory requirements,obstructing the design of hydrogels with characteristics of robustness and rapid self-recoverability.Herein,we present a facile strategy for constructing mechanically robust and rapidly self-recoverable hydrogels.The linear poly(acrylamide-co-itaconic acid)chains crosslink via coordination bonds and minimal chemical crosslinkers to form the hydrogel network.Such design endows the coordination interactions to be asymmetrically distributed.Under deformation,the coordination interactions exhibit a reversible dissociation-and-reorganization property,demonstrating a new mechanism for energy dissipation and stress redistribution.Thus,the hydrogels possess tensile strength up to 12.5 MPa and toughness up to 28.2 MJ/m3.Moreover,the inherent dynamic nature of the coordination bonds imparts these hydrogels with stretch rate-and temperature-dependent mechanical behavior as well as excellent self-recovery performance.The method employed in this study is universal and is applicable to other polymers with load-bearing yet rapid recovery conditions.This study will facilitate diverse applications of most metallosupramolecular hydrogels.

关 键 词：Metallosupramolecular hydrogels Coordination interactions Self-recoverability 

分 类 号：TQ427.26[化学工程]