Compressional Modulus of Swollen Polyacrylamide Networks

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

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

For a set of nominally identical polyacrylamide-water gel samples an experimental comparison is made between the values of Mos, the longitudinal osmotic modulus observed by quasi-elastic light scattering, the osmotic modulus Kos observed by swelling pressure measurements, and the shear modulus G, measured by mechanical deformation. From theoretical considerations it is shown that in inhomogeneous gels Kos + 4/3 G > Mos. The difference observed experimentally is, however, larger than expected from the heterogeneity of these gels and is attributed to the calibration method used in the light-scattering technique. The present results can thus be used as a calibration for the latter method. All the results are consistent with good solvent scaling predictions, which apply for the osmotic deswelling measurements, up to concentrations of 0.25 g cm−3. Moreover, the osmotic Poisson ratio adopts a value 0.275 ± 0.011, in agreement with that expected for fully swollen gels in a good solvent, namely, 0.278.

Original languageEnglish
Pages (from-to)2594-2599
Number of pages6
JournalMacromolecules
Volume21
Issue number8
DOIs
Publication statusPublished - Aug 1 1988

ASJC Scopus subject areas

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

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