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Synthesis and thermal properties of side‐chain liquid‐crystalline poly(glycidyl ethers) with racemic and chiral backbone
Author(s) -
Taton Daniel,
Le Borgne Alain,
Spassky Nicolas,
Noël Claudine
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.1995.021960918
Subject(s) - mesophase , mesogen , epichlorohydrin , polymer chemistry , side chain , polymer , monomer , chirality (physics) , chemistry , moiety , liquid crystal , polymerization , phase (matter) , materials science , organic chemistry , liquid crystalline , chiral symmetry breaking , physics , optoelectronics , quantum mechanics , quark , nambu–jona lasinio model
Oxiranes bearing a 4‐cyanobiphenyl‐4′‐oxy mesogenic group with spacers of different length have been synthesized from glycidyl p ‐toluenesulfonate or epichlorohydrin (racemic or optically active). These monomers were polymerized with anionic initiators (CsOH, tBuOK tBu: tert ‐butyl, Et: ethyl. ) or a chelate initiator (AlEt 3 /H 2 O/acetylacetone ). A transfer of chirality from the polymer backbone to the mesophase is observed for polyethers with a short spacer. A cholesteric phase is observed for the optically active polymer while the racemic polymer is nematic. Increasing the length of the spacer leads to a smectic mesophase. However, in that case, the effect of the chiral centre of the polymer backbone on the mesomorphous properties is not detected.