Dilational rheological properties of polyacrylamide solutions at interfaces

The changes of interfacial viscoelasticity along with measuring time and the effect of partially hydrolyzed polyacrylamide (PHPAM) concentration and type viscoelasticity at the interface between PHPAM and dodecane were investigated by means of dilational method. The results show that response of interfacial adsorption process can be made by interfacial viscoelasticity. Elasticity plays an important role for PHPAM/dodcane system even though contribution of viscosity in viscoelasticity goes up along with the increase of PHPAM concentration. Moreover, different viscoelasticity characteristics at different interfaces for PHPAM solution were also found. Among those three interfaces were experimented, and the order of the numerical value of viscoelasticity from large to small is PHPAM/air interface, PHPAM/dodecane interface and PH-PAM/crude oil interface.