Phase characterization of LC (meth)acrylic monomers based on ω-hexyloxy- and ω-undecyloxy-salicylaldimine groups with different alkoxy tail substitutions |
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Authors: | E A Soto-Bustamante Corresponding author C M Gonzalez-Henriquez G A Rodriguez-Lehyt R O Vergara-Toloza |
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Institution: | Universidad de Chile , Facultad de Ciencias Químicas y Farmacéuticas , Olivos 1007, Casilla 233, Santiago 1, Chile |
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Abstract: | The synthesis and phase characterization of three homologous series of liquid crystalline acrylic and methacrylic monomers, consisting of 21 new compounds are presented. They are based on ω-hexyloxy- and ω-undecyloxysalicylaldimine groups with different alkoxy tail substitutions. The liquid crystalline materials were characterized by polarizing optical microscopy and differential thermal analysis. Smectic A and tilted smectic C phases were observed in the compounds. Near the transition to the isotropic, a narrow nematic phase, coexisting with the smectic A phase, was detected for the pentyloxy and hexyloxy derivatives in the M11 and A11 series. In case of M11R11 and M11R12 only a tilted smectic C phase was detected. The clearing point was comparable for all series, around 100°C. |
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