Abstract
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.
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