Liquid Crystalline Macrocycles and Polyacrylates Containing 4-Alkoxybenzoic Acid and 4-Alkoxybenzamide Structural Units

摘要

The hexa-(4-dodecyloxy) benzamide and hexa-(4-hexyloxy) benzamide derivatives of 18-n6(2 and 3), the tetra-(4-dodecyloxy) benzamide derivative of 14-N4 (7), and a mono-(12- hydroxydodecyl)-penta-(4-dodecyloxybenzoyl) derivative of 18-N6(5) have been prepared, and their phase transitions have been determined by DSC and polarizing microscopy. Compounds 2 and 5 have a discotic mesophase. No mesophase was detected for compounds 3 and 7. The transition temperatures of compound 2 differ substantially from those reported earlier by Lehn, et al., and by DSC 2 exhibits polymer like thermal history. The 12-hydroxy and 12-acryloxy derivatives of 4-(dodecyloxy) benzoic acid and ethyl 4-(dodecyloxy) benzoate were prepared. Only the carboxylic acids had thermotropic mesophases. Free radical polymerizations of the acrylate monomers gave mesogenic polyacrylates with pendant 4-(12-oxydodecyloxy) benzoic acid and ethyl 4-(12-oxydodecyloxy)benzoate side chains. Benzoic acids, Acrylates, Polymers, Liquid crystals, Amides. (mjm)