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Polymers from multifunctional isocyanates, 10 . Thermotropic polyurethanes from triad liquid‐crystalline diesterdiisocyanates
Author(s) -
Mormann Werner,
Brahm Martin
Publication year - 1995
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.1995.021960209
Subject(s) - mesogen , thermotropic crystal , triad (sociology) , mesophase , polymer chemistry , liquid crystal , materials science , extender , polymer , polyurethane , liquid crystalline , composite material , psychology , optoelectronics , psychoanalysis
Binary hard‐segment type polyurethanes from para ‐linked triad aromatic or cycloaliphatic diisocyanatodiesters (1,4‐phenylene dibenzoate, diphenyl terephthalate, diphenyl trans ‐1,4‐cyclohexanedicarboxylate and dicyclohexyl trans ‐1,4‐cyclohexanedicarboxylate) and aliphatic diols as chain extenders are described. Due to the favorable aspect ratio of the triad mesogens most of the polyurethanes have an enantiotropic (nematic) mesophase. The influence of substituents in the mesogen and of the chain extender on the thermal transitions of the polyurethanes was studied and compared with the properties of the parent isocyanates.