分子中にエーテル結合を持つ新しい両性界面活性剤の二, 三の性質

概要

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A new amphoteric surfactant, sodium N-dodecyl N, N-bisethoxyacetate (NaDEA), has been synthesized by the reaction of N-dodecyl N, N-bishydroxyethylamine with sodium monochloroacetate in the presence of sodium hydroxide. NaDEA has high solubility in water and is soluble even at its isoelectric point, probably owing to the ether-bonds in the molecule. The electrical state of NaDEA greatly depends on the pH of the solution, which governs its physicochemical properties. The electrostatic potential of the micelle calculated from the pH titration data is negative above pH 3. The solubilizing power for Yellow OB changes with the pH of the solution and it is greater in the acid region than in the alkaline region. The critical micelle concentration estimated from the solubilization-concentration curve also changes with pH. <BR>Some properties, such as solubilizing power, foaming power and adsorption, of the mixed solutions of NaDEA with sodium dodecyl polyoxyethylene sulfate or sodium dodecylbenzene sulfonate have been examined. Interactions between these surfactants have been observed in the mixed solutions.
社団法人日本油化学会の論文