Le Journal de Physique Colloques 06/1978; 39(C2). DOI: 10.1051/jphyscol:1978229


Les résultats concernant la variation de la viscosité réduite des solutions aqueuses ou à faible force ionique avec la concentration et la contrainte de cisaillement sont revus et discutés. Un modèle comportant cinq domaines de concentrations dans lesquels les conformations des polyions ou l'organisation de la solution seraient différentes pourrait expliquer les observations expérimentales. The results concerning the concentration and the shear stress dependence of aqueous or low ionic strength solutions of polyelectrolytes are reviewed and discussed. A model with five concentrations ranges where the conformations of polyions and the structure of their solutions would be different may explain the expérimental data.

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    ABSTRACT: We have developed an apparatus which enables us to perform accurate measurements of the shear viscosity of low ionic strength, dilute polyelectrolyte solutions, down to polymer concentrations below one part per million. We have shown that a theoretical expression for the viscosity of such solutions can be derived using the mode–mode coupling approximation to the hydrodynamics of charged Brownian spheres. Very good agreement between the predicted and observed polymer and salt concentration and molecular weight dependence of the viscosity is observed in the low‐added salt, dilute solution range. Furthermore, it appears that the theory gives a qualitatively correct description of the viscosity of semidilute solutions, indicating that independent of polyion concentration, the hydrodynamics of low ionic strength polyelectrolyte solutions is dominated by electrostatic repulsion between polyions.
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