A transport model for swelling of polyelectrolyte gels in simple and complex geometries

E. C. Achilleos, K. N. Christodoulou, I. G. Kevrekidis

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

A model for the swelling of polyelectrolyte gels in salt solutions is developed and solved numerically. The model accounts for the effect of network stress, osmotic pressure, and electrical potential on the species diffusive flux. The osmotic pressure and the network stress are derived from the Helmholtz free energy of the system that is the sum of mixing, elastic, and electrostatic components. One- and two-dimensional swelling in unconstrained and constrained geometries are simulated for a salt-solvent-polymer system. The transient and equilibrium fields of electrical potential, concentrations, deformation, and stress are obtained. Transient overshoots and non-uniformities in the residual profiles are predicted.

Original languageEnglish (US)
Pages (from-to)63-80
Number of pages18
JournalComputational and Theoretical Polymer Science
Volume11
Issue number1
DOIs
StatePublished - Jan 2001

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Keywords

  • Gel
  • Polyelectrolyte
  • Swelling
  • Transport

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