Constitutive modeling of strain-dependent bond breaking and healing kinetics of chemical polyampholyte (PA) gel

Sairam Pamulaparthi Venkata; Kunpeng Cui; Jingyi Guo; Alan T Zehnder; Jian Ping Gong; Chung-Yuen Hui

doi:10.1039/d1sm00110h

Constitutive modeling of strain-dependent bond breaking and healing kinetics of chemical polyampholyte (PA) gel

Soft Matter. 2021 Apr 21;17(15):4161-4169. doi: 10.1039/d1sm00110h.

Authors

Sairam Pamulaparthi Venkata¹, Kunpeng Cui², Jingyi Guo¹, Alan T Zehnder¹, Jian Ping Gong³, Chung-Yuen Hui⁴

Affiliations

¹ Field of Theoretical and Applied Mechanics, Department of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA. ch45@cornell.edu.
² Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan.
³ Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo 001-0021, Japan and Soft Matter GI-CoRE, Hokkaido University, Sapporo 001-0021, Japan and Faculty of Advanced Life Science, Hokkaido University, Sapporo 001-0021, Japan.
⁴ Field of Theoretical and Applied Mechanics, Department of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA. ch45@cornell.edu and Soft Matter GI-CoRE, Hokkaido University, Sapporo 001-0021, Japan.

PMID: 33881129
DOI: 10.1039/d1sm00110h

Abstract

A finite strain nonlinear viscoelastic constitutive model is used to study the uniaxial tension behaviour of chemical polyampholyte (PA) gel. This PA gel is cross-linked by chemical and physical bonds. Our constitutive model attempts to capture the time and strain dependent breaking and healing kinetics of physical bonds. We compare model prediction by uniaxial tension, cyclic and relaxation tests. Material parameters in our model are obtained by least squares optimization. These parameters gave fits that are in good agreement with the experiments.