Lyotropic LCs can be formed by simply mixing the polymerizable surfactant METDAB and water. To preserve the mesophase morphologies, additional cross-linkers may be introduced into the system. The binary surfactant/water phase diagram was obtained by systematic variation of the weight ratio of surfactant to water and characterization of the corresponding surfactant/water mixtures using POM and x-ray scattering. The formation of direct hexagonal phases (H1) at room temperature was found to locate in the window of METDAB contents from 55 to 80 wt %. The cross-linkable H1 phase used for the preparation of H1 polymer membranes was obtained by mixing 70 wt % METDAB, 22.8 wt % water, 5.4 wt % OEG-DMA, and 1.8 wt % EG-DMA (doped with a radical initiator). This formulation was able to be cross-linked and to give the excellent preservation of the H1 morphology. Cross-linking/polymerization of mesophases was conducted in an N2 atmosphere using a focused spot UV beam for 30 min (100-W Sunspot SM spot curing system at a distance of ∼2 cm).

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