Rheological Properties of Partially Hydrolyzed Polyacrylamide Solutions

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Abstract
An experimental study was conducted to investigate the effect of salt on viscoelastic properties of partially hydrolyzed polyacrylamide Pusher 700 (Dow Chemical) in aqueous solutions. Viscosity η and primary normal stress differences N1, were measured on a Weissenberg rheogoniometer and a Contraves low‐shear viscometer. The experimental results show the well known stabilizing effect of salt on the solutions' viscosity (i.e., the solutions become less viscous and less shear thinning) up to a critical value of shear rate, γ̇c, which depends on salt and polymer concentrations. For values of shear rate greater than γ̇c, both η and N1 exhibit appreciable increases with increasing shear rate. The amplitude of the so‐called shear‐thickening phenomenon increases with increasing salt concentration. For γ̇>γ̇c the presence of salt has no apparent effect on either η or N1 of the concentrated polymer solutions. For lower polymer concentrations, the addition of salt increases markedly the values of η and N1. The inves...

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