Concentration polydispersity in polymer gels

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

Research output: Contribution to journalArticle

Abstract

For swollen polymer networks there is no generally accepted relation between the macroscopic osmotic properties and the scattering behaviour. Detailed information on the relationship between these properties can, however, be deduced from complementary measurements of osmotic and elastic behaviour, small angle neutron and X‐ray scattering (SANS and SAXS) and quasi‐elastic light scattering. We describe such an investigation in two types of networks, differing in the mechanism of cross‐linking. The SANS spectra yield information on the structure, which is generated both by the dynamics of the system and by long range static constraints. The former, arising from thermodynamic concentration fluctuations, governs the macroscopic osmotic and elastic moduli of the swollen network. The static superstructure in the gel reflects local variations in the cross‐link density. The resulting concentration polydispersity, <δφ2>/φ2, is determined by the details of the cross‐linking procedure. Its concentration dependence as a function of gel swelling can be expressed in terms of the same macroscopic osmotic and elastic variables as those that govern the thermodynamic properties of the gel.

Original languageEnglish
Pages (from-to)35-42
Number of pages8
JournalMacromolecular Symposia
Volume93
Issue number1
DOIs
Publication statusPublished - 1995

Fingerprint

Polydispersity
Polymers
Gels
gels
crosslinking
Crosslinking
polymers
Scattering
scattering
swelling
Light scattering
Swelling
modulus of elasticity
Neutrons
neutron scattering
light scattering
Thermodynamic properties
thermodynamic properties
Elastic moduli
Thermodynamics

ASJC Scopus subject areas

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

Cite this

Concentration polydispersity in polymer gels. / Geissler, Erik; Horkay, F.; Hecht, Anne‐Marie ‐M.

In: Macromolecular Symposia, Vol. 93, No. 1, 1995, p. 35-42.

Research output: Contribution to journalArticle

Geissler, Erik ; Horkay, F. ; Hecht, Anne‐Marie ‐M. / Concentration polydispersity in polymer gels. In: Macromolecular Symposia. 1995 ; Vol. 93, No. 1. pp. 35-42.
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