Auto-associação do dodecilsulfato de sódio (SDS) com o polímero hidrofobicamente modificado etil(hidroxietil) celulose (EHEC)

Abstract

Recebido em 7/8/08; aceito em 24/4/09; publicado na web em 22/9/09 SELF-ASSOCIATION OF SODIUM DODECYL SULFATE (SDS) WITH THE HYDROPHOBICALLY MODIFIED POLYMER ETHYL (HYDROXYETHYL) CELLULOSE (EHEC). Mixtures of ethyl(hydroxyethyl)cellulose (EHEC) and Sodium Dodecyl Sulfate (SDS) were investigated using surface tension, conductivity and viscosity measurements in aqueous solutions. The parameters of the surfactant to polymer association processes such as the critical aggregation concentration (cac) and saturation of the polymer by SDS (psp) were determined from the plots of surface tension and specific conductivity versus surfactant concentration. Through the final results we see that there was no specific link of polymer with the surfactant, implying therefore a phenomenon of only cooperative association.