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The rheological properties of partially hydrolyzed polyacrylamide(PHP) aqueous solutions at low shear rates have been studied by using a concentric cylinder rotational rheometer. Some rheological parameters: non Newtonian index( n ), consistency coefficient( K ), apparent viscosity( η a) and yield stress( τ y) have been determined at conditions of different PHP concentration, temperature and salinity. The results showed that at shear rates of 1～5 s -1 a yield stress occurred, PHP aqueous solution behaved as a Bingham fluid and a linear relationship between τ y and PHP concentration( c ) was obtained: τ y= kc .
The rheological properties of partially hydrolyzed polyacrylamide (PHP) aqueous solutions at low shear rates have been studied by using a concentric cylinder rotational rheometer. Some rheological parameters: non Newtonian index (n), consistency coefficient (K), apparent viscosity and yield stress (τ y) have been determined at conditions of different PHP concentration, temperature and salinity. The results showed that at shear rates of 1 ~ 5 s -1 a yield stress occurred, PHP aqueous solution behaved as a Bingham fluid and a linear relationship between τ y and PHP concentration (c) was obtained: τ y = kc.