Complex formation between cationic cellulose polymers and oppositely charged surfactants in aqueous media
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Mixtures of polymers and surfactants are widely used in aqueous media to provide structure, solubilization domains, and/or colloidal stability. Underlying these functions are inter- and intra-molecular interactions that depend on the nature of the polymers and the type of surfactants. We have investigated here the phase behavior of cationic cellulose derivatives in aqueous media upon addition of oppositely charged surfactant, sodium dodecyl sulfate (SDS). The solution behavior and interactions between the polyelectrolyte and the surfactant can be profoundly affected by the polyelectrolyte charge density and hydrophobic modification, as well as by the presence in water of polar organic solvents (cosolvents). Key Words. Phase behavior, polymer-surfactant complexes, polyelectrolyte, sodium dodecyl sulphate (SDS).