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Abstract
AbstractNegative thixotropic behavior in aqueous glycerol solutions of partially hydrolyzed polyacrylamide was studied at various concentrations of Na+, Ca2+ and Al3+ chlorides. A decrease in critical shear stresses and more intensive negative thixotropic behavior observed in the presence of multivalent cations were explained in terms of their stronger charge screening effect. This effect suppresses intermolecular electrostatic repulsions, which act against association of polymer molecules and, thus, against the occurrence of negative thixotropy.
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