Neutron scattering in polymer gels at the theta temperature

Anne‐Marie ‐M Hecht, F. Horkay, Simon Mallam, Erik Geissler

Research output: Contribution to journalArticle


Small angle elastic neutron scattering was performed on three polystyrene networks swollen to equilibrium in cyclohexane at the theta temperature. Comparison of the SANS spectra with similar measurements in uncross‐linked solutions reveals that in the intermediate Q region the gels behave like solutions of lower concentration than the equivalent solutions. We assume that the gel spectra are composed of a static component plus a dynamic, or solution‐like part. By a suitable fitting procedure, the former can be estimated, yielding the mean square static concentration fluctuation <Δφ2> generated by cross‐linking contraints in the gel. Independent measurement of the swelling pressure of these gels permits an estimate to be made of the scattering intensity I(Q=0) of the dynamic part of the spectrum. Plausible agreement is found between the macroscopic and microscopic estimations of the osmotic compressibility if allowance is made for the concentration polydispersity in the gels.

Original languageEnglish
Pages (from-to)103-112
Number of pages10
JournalMakromolekulare Chemie. Macromolecular Symposia
Issue number1
Publication statusPublished - 1993

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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