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Phase transition studies in certain thermotropic liquid crystals thermal microscopy and DSC
Author(s) -
Venkatacharyulu P.,
Gupta A. V. N.,
Rao V. Subba,
Rao J. V.
Publication year - 1987
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170220925
Subject(s) - thermotropic crystal , mesophase , liquid crystal , differential scanning calorimetry , phase transition , crystallography , phase (matter) , optical microscope , cyclohexane , materials science , chemistry , organic chemistry , scanning electron microscope , liquid crystalline , thermodynamics , composite material , physics , optoelectronics
Investigations on the phase transition studies in the thermotropic liquid crystals, (1) pcyanophenyl trans‐4‐propylcyclohexane carboxylate, (2) p‐cyanophenyl trans‐4‐pentyl‐cyclohexane carboxylate, (3) 4′‐n‐pentyloxy‐4‐cyanobiphenyl and (4) 4′‐n‐octyloxy‐4‐cyanobiphenyl are carried out by the thermal microscopy and the differential scanning calorimetric (DSC) studies. These studies reveal that the first three mesogens exhibit a single mesophase while the fourth one exhibits a smectic A phase in addition to the nematic phase. The textures exhibited by these mesogens in their mesophases and their transition temperatures, enthalpies and entropies are presented.