Analysis of Physicochemical Properties Exhibited by Thermotropic Liquid Crystalline Binary Mixtures

Five binary mixtures are obtained as the resultant liquid crystalline complexes obtained from the liquid crystal precursors formed between α-Keto Glutaric acid (KGA) with hexyloxy benzoic acid (6BAO) and α-keto glutaric acid (KGA) with dodecyloxy benzoic acid (12BAO). Variation in the molar proportion of the precursors in a well-defined odd step leads to the formation of five liquid crystalline binary mixtures. Rich-phase polymorphism exhibited by the precursors has triggered this analysis which leads to a wide range of results obtained completely investigated by means of spectral, optical, and thermal characterization techniques. Surface morphology investigation confirms the uniformity in obtaining the binary mixture. KGA + 6BAO exhibit smectic C and smectic G mesophases whereas KGA + 12BAO exhibit nematic, smectic C, and smectic G mesophases. Chemical analysis confirming the intermolecular hydrogen bonding is carried through Fourier transform infrared spectroscopy analysis. Optical analysis corresponding to the mesophase variance of the binary mixtures is carried through polarizing optical microscope. Thermal analysis confirming the transition temperatures and enthalpy values is carried out by differential scanning calorimeter.