Modeling the effects of pH and ionic strength on swelling of polyelectrolyte gels

The Journal of Chemical Physics
A D Drozdov, J deClaville Christiansen

Abstract

A model is developed for the elastic response of a polyelectrolyte gel under unconstrained and constrained swelling in a water bath with an arbitrary pH, where a monovalent salt is dissolved. A gel is treated as a three-phase medium consisting of an equivalent polymer network, solvent (water), and solute (mobile ions). Transport of solvent and solute is thought of as their diffusion through the network accelerated by an electric field formed by mobile and fixed ions and accompanied by chemical reactions (self-ionization of water molecules, dissociation of functional groups attached to polymer chains, and formation of ion pairs between bound charges and mobile counter-ions). Constitutive equations are derived by means of the free energy imbalance inequality for an arbitrary three-dimensional deformation with finite strains. Adjustable parameters in the governing relations are found by fitting equilibrium swelling diagrams on several hydrogels. The effects of pH, ionic strength of solution, and constraints on equilibrium water uptake are studied numerically.

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Citations

Aug 25, 2016·Nature Communications·Yang GaoLi Tan
Jun 15, 2017·Physical Chemistry Chemical Physics : PCCP·Fernando Rodríguez-DíazAileen Lozsán
Nov 5, 2019·Advances in Colloid and Interface Science·Vikram Singh Raghuwanshi, Gil Garnier
Mar 7, 2021·Gels·Matan MusselFerenc Horkay
Jun 8, 2021·Journal of the Mechanical Behavior of Biomedical Materials·Aleksey D Drozdov, Jesper deClaville Christiansen
Jul 3, 2021·Pharmaceutics·Cassiele T CescoAlexandre T Paulino
Aug 29, 2019·ACS Omega·Daniel Pinto RamosEugenia Kumacheva

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