The interaction of mixed surfactants with polyelectrolytes

The interactions between a linear polymer, sodium poly(2- acrylamide-2-meth ylpropane sulfonate), and two cationic surfactants, dodecylpyridinium chlor ide and tetradecylpyridinium chloride and their mixtures with different rat ios, were studied by a potentiometric titration method using a surfactant-s elective electrode. The ideal mixing/ideal cooperative binding model we had proposed previously was applied to successfully predict the binding isothe rms of the mixed surfactant systems and the critical aggregation concentrat ions of the binding. The binding of surfactant mixtures to polymers is simi lar to the ideal mixed micelle formation and a sort of synergetic effect wa s found during the binding process.