Rheological behavior study of cationic surfactant-polyelectrolyte complex (AD37/P4VP-DPC) in aqueous medium
Abstract
Polyelectrolyte 27% hydrolyzed polyacrylamide-poly(4-vinylpyridine) (AD37-P4VP) complex with cationic surfactant dodecylpyridinium chloride (DPC) interactions in aqueous solution, is investigated by rheological measurements, at 20-°C with a fixed neutralization degree α-=-0.1. The results show that the interaction of complex (AD37-P4VP) is favored in the presence of the DPC where the electrostatic interactions are dominant. This interaction is governed by electrostatic and hydrophobic interactions. In the presence of salt, it is more cooperative. Three rheological behaviors are determined of this system show a shear thinning behavior, shear thickening for the strong shear rate and a newtonian behavior. Then, we determine the rheological models of the system to different concentration of P4VP in the presence and absence of salt to justify the rheological behavior of the complex. .