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Synthesis, Characterization, and Thermotropic Properties of Liquid Crystals with an Oligo (Ethylene Oxide) Monomethyl Substituent I: Biphenyl‐Based Systems
Author(s) -
ChangChien GuoPing
Publication year - 1996
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199600059
Subject(s) - mesophase , thermotropic crystal , chemistry , differential scanning calorimetry , ethylene oxide , biphenyl , substituent , liquid crystal , methyl benzoate , organic chemistry , oxide , crystallography , polymer chemistry , copolymer , materials science , liquid crystalline , phase (matter) , physics , optoelectronics , thermodynamics , polymer
New alkene liquid crystals 4‐[oligo(ethylene oxide) o , monomethylether)carbonyl]phenyl 4‐[4(allyloxy) phenyl]benzoate(MBPBEn, n = 1‐3), 4′‐[oligo(ethylene oxide) o , monomethylether)carbonyl]biphenyl‐4‐yl 4‐[4‐(al1yloxy)phenyl]benzoate(MBPBPEn, n = 1‐3), (S)‐4‐[(2‐methyl‐I‐butoxy)carbonyl]phenyl 4[4‐(allyloxy)phenyl]benzoate(MBPBKA), and (S)‐4′‐[(2‐methyl‐l‐butoxy)carbonyl]biphenyl‐4‐yl 4‐[4(allyloxy)phenyl]benzoate(MBPBPKA) were synthesized and characterized using 1 H‐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.