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Filled S A phases in binary liquid crystalline systems of terminal‐nonpolar compounds (III) . The role of the molecule length of the rod‐like component
Author(s) -
Pelzl G.,
Humke A.,
Diele S.,
Ziebarth S.,
Weissflog W.,
Demus D.
Publication year - 1990
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.2170250525
Subject(s) - homologous series , component (thermodynamics) , binary number , phase diagram , phase (matter) , chain (unit) , liquid crystal , crystallography , molecule , binary system , chemistry , terminal (telecommunication) , series (stratigraphy) , long chain , materials science , thermodynamics , organic chemistry , polymer science , physics , mathematics , telecommunications , arithmetic , optoelectronics , astronomy , computer science , paleontology , biology
The phase diagrams of 8 binary systems of liquid crystals are presented whereby one component is a “biswallow tailed” compound and the second component is a member of the homologous series of 4,4′‐bis‐n‐alkyloxy‐azoxybenzenes. In all phase diagrams studied induced smectic A phases occur. X‐ray investigations give evidence that in the binary systems of short‐chain homologues the layer spacing d of the smectic A phase is clearly greater than the average molecular length L̄, whereas in the systems of long‐chain homologoues d is found to be somewhat smaller than L̄. The results are interpreted on the basis of a simple packing model.