The influence of stirring speed on the viscosity of polyacrylamide solution

The influence of stirring speed on the viscosity of polyacrylamide solution

The influence of stirring speed on solution viscosity during polyacrylamide dissolution process:

During the preparation process, stirring speeds of 200r/min and 600r/min were used to measure the viscosity of a series of polyacrylamide aqueous solutions with different concentrations at 30 ° C. It was found that the final viscosity of the solution obtained by dissolving the same appropriate fraction of polyacrylamide solution at different stirring speeds varied greatly. The viscosity of the solution obtained at higher speeds was only about 60% -70% of that obtained at lower speeds. So, during the dissolution process of polyacrylamide, the higher the rotation speed, the lower the viscosity, and the lower the rotation speed, the higher the viscosity.

The effect of stirring speed on the viscosity of polyacrylamide solution after dissolution:

After complete dissolution, the solution was stirred at high speed for a long time, and it was found that the viscosity did not change. The effect of stirring speed on the viscosity of polyacrylamide solution is limited to the dissolution process. After dissolution, the intramolecular hydrogen bonds of polyacrylamide molecules and the intermolecular hydrogen bonds formed by water molecules reach an equilibrium state, forming a secondary structure. The activation energy required to destroy this secondary structure is relatively high. Even if the stirring speed is increased, this secondary structure will not be destroyed, thus no longer affecting the viscosity of the polyacrylamide solution.   ---B