THE STAND OF THE SYSTEM OF SMECTIC LIQUID CRYSTALS BY MISCIBILITY MEASUREMENTS

Abstract
The systematic investigation of the miscibility between l.c. phases in binary systems by the Halle Liquid Crystal Group was extended to the following homologous series 2-[4-n-Alkylphenyl]-5[-4-n-alkoxyphenyl]-pyrimidines, N-[4-n-alkyloxybensylidene]-4-n-alkyl-anilines, Terephtylidene-bis-[4-n-alkyl-anilines], 4-n-Alkoxyphenyl 4-n-alkylcyclohexanecarboxylates. The different variants of polymorphism in these series including the phase types N, A, C, F, B and G are discussed with respect to structural informations especially on the ordered smectic phases of the types F, B and G. A new phase type H has to be established. These phases are low temperature modifications in the sequence FGH of the tilted ordered smectic phases.