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Phase behavior of mixed polyoxyethylene-type nonionic surfactants in water
Authors:Hironobu Kunieda   Hamidul Kabir   Kenji Aramaki  Kazuki Shigeta
Affiliation:

a Division of Artificial Environment and Systems, Graduate School of Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokohama 240-8501, Japan

b Division of Material Science and Chemical Engineering, Faculty of Engineering, Yokohama National University, Tokiwadai 79-5, Hodogaya-ku, Yokohama 240-8501, Japan

Abstract:Cloud temperatures, phase behavior, and the structures of liquid crystals were investigated in the aqueous systems of homogenous hexaethylene glycol dodecyl ether(C12EO6) and mixed C12EO4-C12EO8, C12EO2-EO8, C12EO2-C12EO8, and C12EO0-C12EO8 In the mixed surfactant systems, the average polyoxyethylene- (EO-) chain lengths are kept constants, the same as C12EO6. The change in cloud temperatures is small in all the systems, whereas the phase behavior is successively changed with increasing the difference in EO-chain length in the mixture. Lamellar liquid crystal is developed in the phase diagrams and it intrudes in the two-phase region above the cloud temperature. Hence, the phase pattern of the present mixed surfactant systems resembles that of C12EO5 system, but both cloud point and W+L region appear at much higher temperature. Hence, the Hydrophile-Lipophile Balance of the surfactant is not largely changed by mixing the surfactants but the SAXS results show that the surfactant molecules are more tightly packed in the hexagonal and lamellar phases by mixing. It is considered that when surfactants of different EO-chain lengths are mixed, the considerable reduction in repulsion between the hydrophilic moieties takes place and the surfactant molecules are more tightly packed.
Keywords:
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