Rheological properties of the polyacrylamide aqueous solution

The effects of mass concentration,shearing speed and temperature on the rheological behaviors of polyacrylamide(PAM) aqueous solution were studied by measuring the apparent viscosity under different conditions.The results showed that the apparent viscosity of PAM aqueous solution increased linearly with the increasing concentration of 1.0 ~4.0 g/L.The PAM aqueous solution exhibited characteristics of pseudoplastic fluid at 2.0~4.0 g/L.The apparent viscosity decreased with the increasing shearing speed,and there was a linear relationship between the logarithms of them.The calculated non-newtonian index n decreased with the increase of the consistency coefficient K.The apparent viscosity decreased with the increasing temperature,and the flow activation energy was about 10 kJ/mol.The PAM aqueous solution showed positive thixotropy.