Rheological properties of highly swollen hydrogel suspensions

Abstract : The shear rheology of diluted to concentrated suspensions of weakly cross-linked sodium polyacrylate hydrogels were investigated by concentric cylinder rheometry. The size of the swollen gel particles is dependent on the initial size of the dry particle and on the nature of the added salt. Polyvalent salts are more efficient for contracting the swollen particles than monovalent ones. When suspended in water or in monovalent salt solutions, the viscosity at low concentrations shows a behaviour very similar to the one of flexible polymer solutions. Below the critical overlap concentration, the viscosity is independent of shear rate. The intrinsic viscosity is very large, on the order of 10-15 dL/g. This is in agreement with the large size of these swollen particles. Suspensions of such swollen gel particles are thus a good model for extremely high molecular weight polymer solutions. In polyvalent salt solutions different behaviour of the viscosity curves versus concentration was observed. This effect is caused by chemical cross-linking of the hydrogel by polyvalent ions
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Soumis le : vendredi 24 février 2012 - 11:25:55
Dernière modification le : dimanche 10 novembre 2019 - 11:18:02

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Tatiana Budtova, P. Budtov V., Patrick Navard, S. Y. A. Frenkel. Rheological properties of highly swollen hydrogel suspensions. Journal of Applied Polymer Science, Wiley, 1994, 52 (6), p. 721-726. ⟨10.1002/app.1994.070520601⟩. ⟨hal-00673767⟩

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