IONIC NONIONIC INTERACTIONS IN THE PARTITIONING OF POLYDISTRIBUTED NONIONIC SURFACTANTS

A phase separation model describing both the composition of the interfacial pseudophase and the partitioning of surfactant molecules into the oil and aqueous phases is proposed. Model parameters include the Critical Micelle Concentrations (CMC) and the partition coefficients of the individual surfactant molecules. These are parameters characteristic of the individual surfactant molecules. A second set of parameters relates to surfactant interactions within the interfacial pseudophase. For the cases studied, including those comprised of ternary surfactant systems, it is found that the binary interaction parameters derived from mixture CMC data are adequate to describe all of the experimental results.