Synthesis, Characterization, and Thermotropic Properties of Liquid Crystals with an Oligo (Ethylene Oxide) Monomethyl Substituent I: Biphenyl-Based Systems

Article abstract of DOI:10.1002/jccs.199600059

New alkene liquid crystals 4-[oligo(ethylene oxide)_n monomelhylether)carbonyl]phenyl 4-[4(allyloxy)phenyl]benzoate(MBPBEn, n = 1-3), 4′-[oligo(ethylene oxide)_n monomethylether)carbonyl]biphenyl4-yl 4-[4-(allyloxy)phenyl]benzoate(MBPBPEn, n = 1-3), (S)-4-[(2-methyl-1-butoxy)carbonyl]phenyl 4-[4-(allyloxy)phenyl]benzoate(MBPBKA), and (S)-4′ -[(2-methyl-1-butoxy)carbonyl]biphenyl-4-yl 4-[4-(allyloxy)phenyl]benzoate(MBPBPKA) were synthesized and characterized using ₁H-NMR and elemental analysis methods. The thermal transition temperatures, mesomorphic properties, and mesophase textures of these compounds have been determined by differential scanning calorimetry (DSC), by polarizing optical microscopy, and by X-ray diffraction analysis. The effect of changes in chemical structure on the mesophase properties, mesophase and isotropic transition temperatures, and mesophase textures are discussed.