Constitutive modeling of bond breaking and healing kinetics of physical Polyampholyte (PA) gel
Constitutive modeling of bond breaking and healing kinetics of physical Polyampholyte (PA) gel
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DOI：
10.1016/j.eml.2021.101184
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发表时间：
2021-02-05
影响因子：
4.7
通讯作者：
Hui, Chung-Yuen
中科院分区：
文献类型：
--
作者：
Venkata, Sairam Pamulaparthi;Cui, Kunpeng;Hui, Chung-Yuen
建立了一个三维有限应变非线性粘弹性模型，用于研究物理交联两性聚电解质（PA）凝胶的力学行为。该凝胶的时间依赖性行为是由于沿沿着链骨架随机分布的带相反电荷的单体的离子相互作用。在这项工作中，我们将物理交联大致分为弱键和强键，这取决于它们的生存和重组特性。我们的本构模型连接的应变依赖键断裂和重组动力学在微观制度的凝胶在连续水平的变形。我们比较我们的模型的预测与单轴拉伸，拉伸松弛，循环，和小应变扭转松弛试验。模型中的材料参数采用最小二乘优化方法得到。我们的理论与凝胶的实验行为符合得很好。(C)2021爱思唯尔有限公司保留所有权利。
A three-dimensional finite strain nonlinear viscoelastic model is developed to study the mechanical behavior of a physically cross-linked Polyampholyte (PA) gel. The time dependent behavior of this gel is due to the ionic interactions of oppositely charged monomers randomly distributed along the chain backbone. In this work, we divide the physical cross-links broadly into weak and strong bonds, depending on their survival and reformation characteristics. Our constitutive model connects the strain dependent bond breaking and reforming kinetics in the microscopic regime to the deformation of the gel at the continuum level. We compare the predictions of our model with uniaxial tension, tensile relaxation, cyclic, and small strain torsional relaxation tests. The material parameters in our model are obtained using least squares optimization. Our theory agrees well with the experimental behavior of the gel. (C) 2021 Elsevier Ltd. All rights reserved.