アニオン-非イオン混合界面活性剤濃厚系の溶液物性

概要

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The solution properties of concentrated anionic-nonionic mixed surfactant systems were investigated using a polarizing microscope, differential scanning calorimetry (DSC), and fluorescence probing method. The mixed systems were sodium dodecyl sulfate (SDS) -hexadecyl polyoxyethylene ethers (C16POEn, n=6, 10, 20 and 40). Liquid crystals (hexagonal and lamella type s) and a viscous isotropic solution were formed in a concentrated solution of these mixed surfact ant systems. The liquid crystals could be formed more easily by SDS mixing with a nonionic surfactant including shorter polyoxyethylene chain than that having a longer chain. The amount of bound-water between surfactant molecular layers in the concentrated system was maximum at 0.5 molar ratio of SDS. Micropolarity about the hydropilic group of surfactant molecules in the hexagonal phase increased with the mixing of a nonionic surfactant, attaining a maximum at a 0.5 molar ratio of SDS. Hydrophilic-hydrophilic interaction between surfactant molecules was found essential to liquid crystal formation in the concentrated mixed surfactant systems and also to mixed micelle formation in the dilute system.
日本油化学会の論文