Elastic modulus and equilibrium swelling of polyelectrolyte gels

Michael Rubinstein, Ralph H. Colby, Andrey V. Dobrynin, Jean Francois Joanny

Research output: Contribution to journalArticlepeer-review

213 Scopus citations

Abstract

We present a scaling theory for the modulus G of polyelectrolyte gels as a function of strand length between cross-links, monomer concentration c, salt concentration cs, and preparation conditions (monomer concentration c0 and salt concentration cs°). The theory assumes affine displacement of the junction points when the concentration is changed. With no added salt (cs = cs° = 0), we predict a new concentration dependence of the modulus G ∼ c5/6. In the high-salt limit, we predict the usual concentration dependence for uncharged polymers but a novel dependence on salt concentration, G ∼ c7/12cs1/4. We also predict the modulus to decrease as charge is added to the gel strands. The predicted effects of added salt and charge on modulus have recently been observed by Candau and co-workers. At low concentrations, we discuss the strong stretching of network strands and its effect on modulus and equilibrium swelling.

Original languageEnglish (US)
Pages (from-to)398-406
Number of pages9
JournalMacromolecules
Volume29
Issue number1
DOIs
StatePublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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