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Polyanhydrides, 9 . Thermotropic poly(ester‐anhydride)s derived from naphthalene‐2,6‐dicarboxylic acid and biphenyl‐4,4′‐dicarboxylic acid
Author(s) -
Kricheldorf Hans R.,
Jürgens Claas
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.1996.021970917
Subject(s) - thermotropic crystal , dicarboxylic acid , condensation polymer , naphthalene , biphenyl , polymer chemistry , liquid crystal , chemistry , crystallinity , organic chemistry , materials science , liquid crystalline , polymer , crystallography , optoelectronics
Two series of thermotropic poly(ester‐anhydride)s, LC‐PEAs, were studied. The first series was prepared by polycondensation of naphthalene‐2,6‐dicarbonyl dichloride with silylated 4‐hydroxybenzoic acid, silylated and substituted 4‐hydroxybenzoic acids or silylated 6‐hydroxy‐2‐naphthoic acid. A second analogous series of LC‐PEAs was prepared by means of biphenyl‐4,4′‐dicarbonyl dichloride. Most LC‐PEAs were semicrystalline materials with melting temperatures ( T m ) in the range of 280−400°C. All LC‐PEAs formed a nematic melt above T m , but due to the high temperatures the isotropization was affected by thermal degradation.