Swelling pressure equilibrium of swollen crosslinked systems in an external field. II: The determination of molecular parameters of gelatin/water gels from the swelling pressure-concentration curves

  • -G. Holtus
  • H. Cölfen
  • W. Borchard
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 86)


Physically crosslinked watery gels of a dialyzed pigskin gelatin of type A are investigated by means of equilibrium runs at 10 and 20°C. From the data of the Schlieren patterns the swelling pressure-concentration curves can be calculated. It can be shown that equilibria are achieved in all cases and that the swelling pressure which is calculated for a given concentration is independent of the rotational speed selected for the experiment if all other conditions are kept constant. The results are described by the swelling equation of the Flory-Huggins type where the interaction paramter x is allowed to depend linearly on the polymer concentration. Thus, two interaction constants and the network parameter have been calculated for each network by means of a nonlinear numerical iteration due to the Gauss-Jordan procedure. With these constants the swelling pressure-concentration curves are well described. The x-parameter at low initial concentration of the polymer is very close to the value which has been experimentally determined in polymer solutions in the highly diluted range above the coil-helix transition range. Both x-values reveal the influence of a highly branched structure of the polymer network. The calculated elastic modulus has nearly the same order of magnitude as that which has been obtained from the experimentally determined real part of the complex shear modulus of the same gel.

Key words

Thermoreversible gelation physical network swelling pressure ultracentrifugation Flory-Huggins equation 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1991

Authors and Affiliations

  • -G. Holtus
    • 1
  • H. Cölfen
    • 1
  • W. Borchard
    • 1
  1. 1.Angewandte Physikalische ChemieUniversität-GH-DuisburgDuisburg 1FRG

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