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Liquid crystalline polysiloxanes with thioether type spacers and chiral biphenyl mesogens
Author(s) -
Milano Jean Claude,
Robert Jean Michel,
Vernet Jean Louis,
Gallot Bernard
Publication year - 1999
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/(sici)1521-3935(19990101)200:1<180::aid-macp180>3.0.co;2-o
Subject(s) - mesophase , biphenyl , thioether , substituent , polymer chemistry , polymer , liquid crystal , liquid crystalline , materials science , chemistry , crystallography , organic chemistry , optoelectronics
Two chiral liquid‐crystalline polymers with polysiloxane main chains, thioether type spacers, and biphenyl derivatives bearing one or two chiral atoms as mesogens were prepared by polyhydrosilylation of polymethylhydrogenosiloxane with α ‐thioolefins carrying biphenyl‐based mesogens in the presence of hexachloroplatinic acid. The polymers exhibit two mesophases as a function of temperature. The nature of the first mesophase depends upon the nature of the chiral substituent of the biphenyl, but the second one is always of the SmC * type and covers a large range of temperature.