Abstract
In order to obtain a fundamental information on the emulsion and solubilization dyeings of fibers, the solubility behavior of aqueous dye solutions in nonaqueous surfactant solutions was studied as a function of the temperature. The solubility behavior of dye solutions in surfactant solutions is essentially similar to that of water or aqueous electrolyte solutions as previously reported by Shinoda et al. and present authors, that is, the solubilization region of dye solutions in surfactant solutions rapidly increased in a narrow temperature range. The W/O and O/W emulsion of dyes in anionic surfactant solutions appeared at lower and higher temperature of the solubilization region, but that of dyes in cationic and nonionic surfactant solutions reversed at lower and higher temperature. Particularly, the solubilization region of water in anionic surfactant solutions extended at higher temperature by the presence of acidic dyes. This effect was explained by the Derjauin-Landau-Verwey-Overbeek theory on the interaction of the double layers which were assumed to exist in the water-solubilizing lamellar micelle.
