Viscoelasticity of mixed polyacrylamide solution

The viscoelastic behavior of polyacrylamide solution is crucial for its application in various industries.The mixed polyacrylamide solution was prepared by mixing polyacrylamide with different relative molecular masses according to the defined mass fraction.The viscosity and elasticity of mixed polyacrylamide solution were separately tested with RS150 rheometer and capillary breakup extensional rheometer and compared with those of the single polyacrylamide solution which is directly provided by manufacturer without any mixing.The results indicate that the mixed and single polyacrylamide solutions have the same shear viscosity and intrinsic viscosity.However,some mixed polyacrylamide solutions have higher elasticity than single polyacrylamide solution.The flow resistance of mixed polyacrylamide with higher elasticity is also greater than that of single polyacrylamide solution in porous medium.This paper presents an effective method of mixing polyacrylamides with different relative molecular masses,which can enhance the elasticity of polyacrylamide solution and flowing resistance through porous medium.