Studies on Mechanical and Swelling Behavior of Polymer Networks on the Basis of the Scaling Concept. 7. Effect of Deformation on the Swelling Equilibrium Concentration of Gels

Ferenc Horkay, Miklós Zrinyi

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Poly(vinyl acetate) networks equilibrated with a good diluent (toluene) were deswollen by two methods: (i) cylindrical form gel specimens were subjected to unidirectional compression at fixed activity of the diluent in the outer phase; (ii) the activity of the diluent around the freely swollen gel specimens was lowered by dissolving a polymer in the surrounding media. Modulus measurements (at fixed volume) were performed at each stage of dilution. The power law exponent of the concentration dependence of elastic moduli of gel homologues equilibrated with pure diluent was found to be equal to 2.33. The experimental volume fractions (ϕ) of deswollen gels were close to that calculated on the basis of the equation ϕ = ϕe; e-4/9, where ϕe is the volume fractions of the polymer in the freely swollen gel and e is the deformation ratio relative to the length of the freely swollen undeformed gel. The results of Treloar4 on natural rubber samples equilibrated with heptane or benzene were also discussed, with particular reference to the dependence of the swelling degree on unidirectional deformation. The chemical potential of the diluent in the deswollen gel was obtained not only from the osmotic pressure of the polymer solution being in equilibrium with the gel but also from the mechanical properties of the deswollen gel. Relationships were evaluated between the swelling pressure, elastic modulus, deformation ratio, and polymer concentration.

Original languageEnglish
Pages (from-to)3260-3266
Number of pages7
JournalMacromolecules
Volume21
Issue number11
DOIs
Publication statusPublished - Nov 1 1988

ASJC Scopus subject areas

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

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