Abstract
The A−B-type silicone copolymer, Me3SiO−(Me2SiO)23−Me2SiCH2CH2CH2−O−(CH2CH2O)51.6H (Si25C3EO51.6), forms only lamellar liquid crystal (Lα) in water over a whole range of concentrations. Rich phase behavior was observed upon addition of conventional nonionic surfactant, C12EO5, whose molecular weight is ∼1/10 of Si25C3EO51.6. For both amphiphiles, f, the volume fraction of hydrophilic part in amphiphile, is the same, and f = 0.5. C12EO5 alone forms aqueous micellar solution (Wm), normal hexagonal (H1), bicontinuous cubic (V1), lamellar (Lα), and reverse micellar solution (Om) phases in water with increasing surfactant concentration. On the other hand, Wm, discontinuous micellar cubic (I1), Lα, reverse bicontinuous cubic (V2), and reverse hexagonal (H2) phases are successively formed in water at a 70/30 weight ratio of Si25C3EO51.6/C12EO5. A reduction in the effective cross-sectional area per amphiphile at hydrophobic surface (aS) takes place upon addition of C12EO5 in the mixed system. A small amphiphile, ...
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