Volume 47, Number 6, September II 1999
|Page(s)||729 - 735|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Concentration dependence of the low-shear viscosity of polyelectrolyte micro-networks: From hard spheres to soft microgels
Unité Mixte de Recherche CNRS-Elf Atochem 95 rue Danton, 92303 Levallois-Perret, France
2 Elf Atochem, Cerdato - 27470 Serquigny, France
Accepted: 12 July 1999
The low-shear viscosity of polyelectrolyte microgels is studied as a function of concentration, crosslink density and ionic strength. The variation of the viscosity with volume fraction is very similar to that found in hard-sphere colloidal suspensions. In salt-free dispersions, osmotic effects are responsible for the de-swelling of microgels at high polymer concentration. This "softening” effect modifies the viscosity near the overlap concentration.
PACS: 83.70.Hq – Heterogeneous liquids: suspensions, dispersions, emulsions, pastes, slurries, foams, block copolymers, etc / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling / 82.70.Dd – Colloids
© EDP Sciences, 1999
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