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pp.111-117
Density, viscosity, conductance, dye solubility and carbon-13 nmr studies were performed in aqueous solution of three disodium 4-n-alkyl-3-sulfonatosuccinate anionic surfactant at 20℃. The cmc values were 0.14 mol/l for the disodium-4-n-octyl-3-sulfonatosuccinate(R8)S), 0.041mol/l for the disodium-4-n-decyl-3-sulfonatosuccinate(R10S), and 0.018mol/l for the disodium-n-dodecyl-3-sulfonatosuccinate 〈R12S). The aggregation numbers determined viscometrically and conductimetrically were 28 for R8S, 48 for R10S, and 67 for R12S. The volume changes upon micellization were 8.9cm3/mol for R8S, 9.5cm3/mol for R10S, and 10.1cm3/mol for R12S. Binding constants for the dye pada to the micelles and the fractions of unbound counter-ion were also obtained. The two polar heads with their carbon linkage were likely in an aqueous environment in the R8S micelles with the micelles themselves being spherical.
