Scaling laws and polystyrene networks - a quasi-elastic light-scattering study

N.S. Davidson, R.W. Richards, E. Geissler

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Randomly crosslinked networks with a range of crosslink densities were prepared by γ-irradiation. Quasielastic light scattering measurements were made on the gels swollen to equilibrium in cyclohexane at 308, 318 and 333 K. The longitudinal osmotic modulus Mos was obtained from the intensity of the dynamically scattered light, and the cooperative diffusion coefficient Dc calculated from the relaxation rate of the autocorrelation function. The concentration dependence of these parameters at the theta temperature was found to be consistent with the scaling predictions, but at higher temperatures where excluded volume conditions prevail, deviations from scaling behaviour were observed. These discrepancies are probably caused by defects in the network structure.
Original languageEnglish
Pages (from-to)1643-1646
Number of pages3
JournalPolymer
Volume26
Issue number11
DOIs
Publication statusPublished - 1985

Keywords

  • scaling
  • networks
  • light scattering
  • polystyrene

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