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The thermotropic mesomorphism of four-chains phasmids is similar to that of lyotropic systems. A cubic Im3m mesophase can be detected between a lamellar phase on one side and a columnar phase on the other side. Moreover, the same cubic phase is found for some three-chains phasmids. The lattice cell unit of this phase has been measured for several pure compounds and for binary mixtures. These measurements are consistent with a model of the molecular organisation in which two labyrinthes, each made of two molecular layers, are delimited by a periodic minimal balance surface. The layer thicknesses and the mean chain area are calculated on the basis of this model

STRUCTURAL STUDY OF THE LAMELLAR TO COLUMNAR TRANSITION IN THERMOTROPIC LIQUID CRYSTALS : THE THERMOTROPIC CUBIC PHASE OF SOME PHASMIDIC MOLECULES