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Main‐Chain Liquid Crystalline Polymers Based on Bis‐Etherified 9,9‐Dihexyl‐2,7‐bis(4′‐hydroxy‐1,1′‐biphen‐4‐yl)fluorenes
Author(s) -
Sović Tanja,
Kappaun Stefan,
Koppitz Andreas,
Zojer Egbert,
Saf Robert,
Bartl Karin,
FodorCsorba Katalin,
Vajda Aniko,
Diele Siegmar,
Pelzl Gerhard,
Slugovc Christian,
Stelzer Franz
Publication year - 2007
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.200600657
Subject(s) - mesophase , biphenyl , polymer , liquid crystal , polyimide , polymer chemistry , monomer , materials science , olefin fiber , chemistry , organic chemistry , layer (electronics) , nanotechnology , composite material , optoelectronics
A series of liquid crystalline compounds based on 2,7‐bis(biphenyl)fluorenes was synthesised by a Suzuki cross‐coupling reaction and subsequent etherification with different bromoalkenes. By simple variations of the chain lengths the temperature range in which the nematic mesophase is present could be tuned. The described approach offers the possibility of covalent incorporation of the mesogens into polymers via olefin metathesis techniques, resulting in enlarged stability of the mesophase. Monomers and polymers could be easily aligned on rubbed polyimide substrates as revealed by polarised absorption spectroscopy.