The H2-phase of the lyotropic liquid crystal sodium 3,4,5-tris(omega-acryloyloxyundecyloxy)benzoate

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Abstract
The phase behaviour of the lyotropic liquid crystal sodium 3,4,5-tris(omega-acryloyloxyundecyloxy)-benzoate was investigated by small angle X-ray scattering. The water content of the lyotropic liquid crystal phase was varied between 8 and 20wt% and the investigations were performed in a temperature range up to 70oC. A reversed hexagonal structure (H2-phase) as well as the isotropic phase were observed. The lattice constant of the H2-phase was found to be independent of the water content. An extremely small dependence on temperature could be found. Based on the shape of the molecules and the observed structural properties, a model for the arrangement of the molecules within the H2-phase is given. The transition temperature from the H2-phase to the isotropic phase decreases significantly from 60oC for the sample with 8wt% water content to 30oC for the sample with 20wt% water content.