Constitutive behaviors of tough physical hydrogels with dynamic metal-coordinated bonds
Constitutive behaviors of tough physical hydrogels with dynamic metal-coordinated bonds
复制标题
具有动态金属配位键的坚韧物理水凝胶的本构行为
DOI：
10.1016/j.jmps.2020.103935
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发表时间：
2020-06-01
影响因子：
5.3
通讯作者：
Qian, Jin
中科院分区：
文献类型：
--
作者：
Lin, Ji;Zheng, Si Yu;Qian, Jin
金属配位介导的物理水凝胶表现出高强度/韧性和有趣的力学行为，具有明显的速率依赖性粘弹性和加载路径依赖性应变软化。此外，重新加载的凝胶的应力随着更多的等待时间而增加，表明自愈合效应。本文的目的是建立一个本构模型来捕捉这些复杂的机械行为的金属配位介导的物理水凝胶。该理论框架包括两个主要的物理机制：微观动力学解离/交联和凝胶网络的非弹性构象变化的协会。模型预测符合凝胶响应的实验数据在不同的情况下，同时捕获的时间依赖性的应力响应，松弛，滞后，自我修复行为，以及最终失败。本工作可为金属配位键介导的坚韧水凝胶作为承重材料的设计和实际应用提供理论指导和方法支持。(C)2020爱思唯尔有限公司版权所有。
Metal-coordination mediated physical hydrogels exhibit high strength/toughness and intriguing mechanical behaviors with the pronounced rate-dependent viscoelasticity and loading-path dependent strain softening. Also, the stress of the reloaded gels increases with more waiting time, indicating a self-healing effect. This paper aims to develop a constitutive model to capture these complex mechanical behaviors of the metal-coordination mediated physical hydrogels. The theoretical framework incorporates two main physical mechanisms: the microscopic kinetic dissociation/association of cross-links and inelastic conformational changes of gel networks. The model predictions agree well with the experimental data of gel responses under different scenarios, which simultaneously capture the time-dependent stress response, relaxation, hysteresis, self-healing behavior, as well as ultimate failure. The present work can provide theoretical guidance and methodological support for the design and practical applications of tough hydrogels mediated by metal-coordinated bonds as load-bearing materials. (C) 2020 Elsevier Ltd. All rights reserved.