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Thermotropic liquid crystalline compounds with lateral long‐chain substituents (IV). Physical properties of 1,4‐bis‐[4‐n‐octyloxybenzoyloxy]‐2‐n‐alkylbenzenes
Author(s) -
Demus D.,
Diele S.,
Hauser A.,
Latif I.,
Selbmann Ch.,
Weissflog W.
Publication year - 1985
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.2170201119
Subject(s) - alkylbenzenes , thermotropic crystal , liquid crystal , miscibility , steric effects , phase transition , chemistry , phase (matter) , thermodynamics , crystallography , liquid crystalline , organic chemistry , materials science , polymer , benzene , physics , optoelectronics
In 15 Substances of general formulatransition temperatures, transition enthalpies and entropies, densities and phase transition volumina, order parameters of a dissolved dye and optical refractive indices were measured. Additional miscibility and X‐ray investigations were performed. The results are discussed on the basis of molecular statistical theories of the nematic state and point to a conformation of the long lateral chains which is nearly parallel to the molecular long axes. The results further show the dominating importance of the steric repulsive forces in stabilizing the nematic state.