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Synthesis of symmetric and asymmetric carbazolyl monomers and their siloxane polymers. Effect of the 2,3,6,7,9‐substitution in the carbazole unit on its mesomorphic behaviour
Author(s) -
Dobarro Alicia,
Velasco Dolores,
Arnim Volkmar v.,
Finkelmann Heino
Publication year - 1997
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.1997.021980816
Subject(s) - carbazole , differential scanning calorimetry , polymer , materials science , monomer , liquid crystal , siloxane , polymer chemistry , side chain , phase (matter) , optical microscope , crystallography , chromophore , chemistry , photochemistry , organic chemistry , composite material , scanning electron microscope , thermodynamics , physics , optoelectronics
A general synthetic route toward symmetric and asymmetric side‐on and end‐on carbazolyl monomers has been developed. The effect of the nature of the core on the induction of liquid‐crystal phases in side‐on carbazolyl polysiloxanes has been studied. Chromophores have been introduced into the carbazole core to produce materials with improved second‐order non‐linear optical (NLO) properties. The mesomorphic behaviour of all the polymers has been investigated by optical microscopy, differential scanning calorimetry (DSC) and X‐ray diffraction. The side‐on polymers are isothropic or crystalline except one of them that presents a metastable nematic phase.