Abstract
The behavior of liquid oily materials on the low energy surface in aqueous surfactant solutions has been studied from a stand point of surface chemistry. A polypropylene sheet was used as the low energy surface, and C6C14 saturated fatty alcohol, C6C11 fatty acids and C10C14 n-paraffin were used as liquid oily materials. Surfactants used were sodium dodecyl sulfate and linear allkylbenzensulfonate.
The interfacial tension and contact angle of oily droplet on polypropylene in both the surfactant solutions were measured. From the results, it was found that when oily materials come into contact with the surfactant solution, dissolution, solubilization, rolling-up, and complex formation occurred, and these phenomena depended upon the carbon chain length of alkyl group of oily materials and the concentration of surfactant.
It was also found from this investigation that the sodium dodecylsulfate differed from the linear alkylbenzenesulfonate in the interfacial behavior.
