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Semi‐rigid thermotropic liquid‐crystalline copolycarbonates comprising main‐chain hexafluoropentane segments
Author(s) -
Sato Moriyuki,
Tada Yuji,
Goto Yusuke,
Mukaida Kenichi
Publication year - 1995
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1995.030160208
Subject(s) - thermotropic crystal , differential scanning calorimetry , liquid crystal , copolymer , biphenyl , materials science , condensation polymer , polymer chemistry , moiety , crystallography , chemistry , polymer , liquid crystalline , organic chemistry , composite material , thermodynamics , physics , optoelectronics
Novel semi‐rigid fluorocarbon‐containing coplycarbonates composed of biphenyl moiety and rigid rod‐like hexafluoropentane chain were prepared by melt polycondensation of 6,6′‐(biphenyl‐4,4′‐diyldioxy)dihexanol ( 1 ) and 2,2,3,3,4,4‐hexafluoro‐1,5‐pentanediol ( 2 ) with alkylene diphenyl dicarbonates 3 of various aliphatic lengths ( m = 6, 8, 10 and 12). The structures of the copolymers 4 were confirmed by FT‐IR, 1 H and 13 C NMR spectra and elemental analyses. The thermal and liquid‐crystalline (LC) properties were examined by differential scanning calorimetry (DSC), polarizing microscopy and temperature‐changeable X‐ray analyses. These measurements indicated that the copolymers show well‐defined thermotropic nematic textures and have block‐like sequences. It is suggested that the introduction of the hexafluoropentane chain into the main chain gives more stable LC phases.