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Surfactant mixtures are very often used in various cosmetic and   pharmaceutical products because they commonly act in synergism and provide   more favorable properties than the single surfactants. At the same time, the   9 presence of polymers in mixtures of surfactants may lead to molecular   interactions thereby affecting product stability and activity. For these   reasons it is very important to determine the surfactant interactions   influence on 1micellization and mixed micellization, as well as   polymer-surfactants mixed micelles interactions. In this work we examined   self-aggregation of nonionic surfactants, polysorbate 20 (Tween 20),   polyoxyethylene octylphenyl ether (Triton X100) and   polyoxyethylene-polyoxypropylene block copolymer (Pluronic F68) with ionic   surfactant, sodium dodecylsulfate, in aqueous solution at 40ºC using   conductometric titration method. It was found that concentration region for   mixed micelle formation depends on nonionic surfactant characteristics and   its concentration. Formation of surfactants mixed micelles in the presence of   nonionic polymer, hydroxypropylmethyl cellulose, and their binding to polymer   hydrophobic sites, were investigated too. Analysis of obtained results points   to different kinds of interactions in investigated systems, which are crucial   for their application. [Projekat Ministarstva nauke Republike Srbije, br. III   46010

A conductometric investigation of hydroxypropylmethyl cellulose/sodium dodecyl sulfate/nonionic surfactant systems