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The thioether spacer in liquid crystalline polysiloxanes with cyano‐ and nitrobiphenyl mesogens
Author(s) -
Milano Jean Claude,
Robert Jean Michel,
Vernet JeanLouis,
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(19990701)200:7<1580::aid-macp1580>3.0.co;2-a
Subject(s) - thioether , hydrosilylation , mesophase , chemistry , polymer chemistry , side chain , crystallization , olefin fiber , organic chemistry , phase (matter) , catalysis , polymer
Six new side‐chain liquid crystalline polysiloxanes with thioether type spacers bearing cyanobiphenyl or nitrobiphenyl moieties at the termini were prepared by hydrosilylation of α ‐thioether groups containing olefins in the presence of hexachloroplatinic acid. The rates of grafting are higher than 90% on condition that the α ‐olefin does not contain sulfur atoms in allylic position. All the obtained polysiloxanes present the SmA d mesophase. Sulfur permits one to obtain long spacers without resulting in of crystallization.