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Influence of chirality on the phase behaviour of copolymers containing cholesterol as mesogenic moiety
Author(s) -
Weidner Steffen,
Wolff Dietmar,
Springer Jürgen
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970413
Subject(s) - mesogen , copolymer , polymer chemistry , chirality (physics) , moiety , differential scanning calorimetry , mesophase , methylene , chemistry , ether , side chain , liquid crystal , crystallography , phase (matter) , organic chemistry , materials science , polymer , liquid crystalline , chiral symmetry breaking , physics , optoelectronics , quantum mechanics , quark , nambu–jona lasinio model , thermodynamics
Liquid‐crystalline side‐group copolymers containing cholesterol and chiral nonmesogenic chloropropionate acid groups were synthesized and investigated by means of size‐exclusion chromatography, proton nuclear magnetic resonance ( 1 H NMR), polarization microscopy, X‐ray diffraction and differential scanning calorimetry. In addition the spacers of the cholesterol‐containing side groups were modified by substitution of two of the methylene groups by oxygen ether groups. The cholesterol‐containing homopolymer displays only an S A ‐mesophase. Amounts of more than 50 mol‐% of the non‐mesogenic chiral co‐compounds led to the total disappearance of liquid‐crystalline phases. For less than 50 mol‐% a different phase behaviour was observed for the copolymers with unsubstituted and ether‐substituted spacers. Phase transition temperatures depend also on the chirality of the non‐mesogenic groups. Similar results were obtained by investigating a copolymer system, which contains chiral camphor‐10‐sulfonic acid moieties and which was synthesized to check this observation.