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

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

Research output: Contribution to journalArticle

5 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.
LanguageEnglish
Pages1643-1646
Number of pages3
JournalPolymer
Volume26
Issue number11
DOIs
Publication statusPublished - 1985

Fingerprint

Elastic scattering
Scaling laws
Polystyrenes
Light scattering
Cyclohexane
Autocorrelation
Gels
Irradiation
Temperature
Defects

Keywords

  • scaling
  • networks
  • light scattering
  • polystyrene

Cite this

Davidson, N.S. ; Richards, R.W. ; Geissler, E. / Scaling laws and polystyrene networks - a quasi-elastic light-scattering study. In: Polymer. 1985 ; Vol. 26, No. 11. pp. 1643-1646.
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Scaling laws and polystyrene networks - a quasi-elastic light-scattering study. / Davidson, N.S.; Richards, R.W.; Geissler, E.

In: Polymer, Vol. 26, No. 11, 1985, p. 1643-1646.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Scaling laws and polystyrene networks - a quasi-elastic light-scattering study

AU - Davidson, N.S.

AU - Richards, R.W.

AU - Geissler, E.

PY - 1985

Y1 - 1985

N2 - 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.

AB - 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.

KW - scaling

KW - networks

KW - light scattering

KW - polystyrene

U2 - 10.1016/0032-3861(85)90278-2

DO - 10.1016/0032-3861(85)90278-2

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T2 - Polymer

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