AbstractThe adsorption of sodium dodecyl sulfate on polystyrene‐styrene interfaces has been studied. Polystyrene interfaces of 20 and 60 were considered. Initial surfactant concentrations used in the study were 0.0004, 0.0008, and 0.004 mole/l. Two temperature levels, 25 and 75°C., were studied. Results showed no effect of initial surfactant concentration for a 20 interface at 25°C. However, the data for the 60 interface at 25°C. showed an effect of initial surfactant concentration. The apparent anomaly in the results regarding effect of initial surfactant concentration was explained in terms of the behavior of polystyrene‐styrene as a mixed absorbent and the work of Harkins and co‐workers, which showed that surfactant adsorption was a function of initial surfactant concentration over certain concentration ranges. Rate of surfactant adsorption appeared to be a function of surfactant adsorption raised to a power. The order of the adsorption appeared to be first‐order for the 20 interface and second‐order for the 6
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