Reentrant Nematic Phases in Binary Systems of Terminal-Nonpolar Compounds II. Binary Systems of 4-n-Heptyloxyphenyl 4-[4-ethylcyclo-hexanoyloxy]-benzoate with Homologues of the n-Alkyl 4-[4-ethoxybenzylidene amino]-α-methylcinnamates

Abstract

To examine the influence of chemical structure on the occurrence of reentrant nematic phases in binary systems of terminal-nonpolar compounds, the phase diagrams of such systems were studied where the nematogenic component (n-heptyloxyphenyl 4-[4-ethylcyclohexanoyloxy]-benzoate) was the same and the smectogenic components were homologous n-alkyl 4-[4-ethoxybenzylidene-amino]-α-methylcinna-mates (from C₂-C₁₂). It was found that reentrant nematic phases occur only for mixtures containing the higher homologues of the smectogenic series.

Key Words:

• reentrant nematic phase
• binary mixtures
• terminal non-polar compounds