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Layer structures, 13. Chiral sanidic polyesters derived from 2,5‐bis(alkylthio)terephthalic acids
Author(s) -
Kricheldorf Hans R.,
Wulff Dirk F.,
Wutz Christoph
Publication year - 1999
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/(sici)1521-3935(19990401)200:4<799::aid-macp799>3.0.co;2-s
Subject(s) - terephthalic acid , polyester , terephthaloyl chloride , polymer chemistry , condensation polymer , liquid crystal , phase (matter) , texture (cosmology) , chloride , materials science , chemistry , organic chemistry , polymer , optoelectronics , artificial intelligence , computer science , image (mathematics)
Two chiral terephthalic acids were synthesized from ( S )‐2‐methylbutane‐1‐thiol and bromoterephthalic acid or 2,5‐dibromoterephthalic acid. A series of chiral polyesters was then prepared by polycondensation of silylated 4,4′‐dihydroxybiphenyl and mixtures of 2,5‐bis(dodecylthio)terephthaloyl chloride and 2,5‐bis(( S )‐2‐methylbutylthio)terephthaloyl chloride. The copolyesters were characterized by elemental analyses, viscosity, DSC and X‐ray measurements, and optical microscopy. Depending on the reaction conditions low and high molecular weights were obtained. In addition to a solid sanidic phase these polyesters form a chiral sanidic LC‐phase and a chiral nematic LC‐phase. However, in contrast to a normal cholesteric melt, these polyesters did not form a Grandjean texture but display the unusual “sausage texture”.