Interaction between weak neutralized polyelectrolyte complex polyacrylamide/poly(4-vinylpyridine) and sodium dodecylsulfate in saline medium.
Résumé
The rheol. behaviors of aq. solns. of polyelectrolyte complex 27% hydrolyzed polyacrylamide [AD37]/poly(4-vinylpyridine) [P4VP] and charged surfactant, sodium dodecylsulfate (SDS), at neutralization degree α = 0.1, are reported. Viscosity variations of this system show a shear thinning behavior for the strong shear rate. For low concns. in P4VP, and at low shear rate, the fluid presents a Newtonian behavior and tends to disappears when the concn. in P4VP increases (4.10-4 g/mL). The interaction of complex (AD37-P4VP) is favored in the presence of the SDS where the electrostatic repulsions are dominant. Obtained results demonstrate that surfactant-complex polyelectrolyte interaction is governed by both electrostatic and hydrophobic interactions, and is cooperative in the presence of salt. [on SciFinder(R)]