ABSTRACT
The case of polymer/surfactant pairs in which the polymer is a polyion and the surfactant is also ionic but bears the opposite charge is of special interest. The case of uncharged polymer/charged surfactant systems can be seen in the existence of an "interaction zone", but in the present case this zone is shifted to much lower surfactant concentration. An interesting finding was that the equilibrium surface tension appeared to be solely dependent on the sodium dodecyl sulfate concentration, that is, was independent of that of polylysine, within the limits of the concentrations employed. Sodium docosyl sulfate (SDS) was used in order to attain water insolubility. Verification of the correctness of these views was obtained from electrophoresis measurements on fine particles of precipitate withdrawn from a series of aqueous compositions containing a constant concentration of Polymer JR and varying amounts of SDS.
