Osmotic Swelling of Poly(vinyl acetate) Gels at the θTemperature

Ferenc Horkay, Erik Geissler, Anne Marie Hecht, Miklos Zrinyi

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Three types of experiments are described in this paper to measure the osmotic swelling parameters of a series of poly(vinyl acetate) gels of different cross-link densities at the θ temperature in isopropyl alcohol. These are (1) measurement of the swelling pressure, ω, during isotropic deswelling of the gel, using a semipermeable membrane and a polymer solution of known activity; (2) measurement of the macroscopic constant volume shear modulus, G; and (3) measurement of the gel concentration at equilibrium swelling with the pure solvent, when the samples are subjected to varying degrees of uniaxial compression. The results of all the observations are in agreement with a solvent chemical potential consisting of only two terms. The first, elastic term is proportional to 01/3, where ϕ is the polymer volume fraction, and the second, mixing, term is proportional to ϕ3, as expected at the θ condition. The osmotic Poisson ratio, σos, is found to be equal to 1/3.

Original languageEnglish
Pages (from-to)2589-2594
Number of pages6
Issue number8
Publication statusPublished - Aug 1 1988


ASJC Scopus subject areas

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

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