Title: Synthesis and liquid crystalline properties of thermotropic copolycarbonates
Authors: DeBacker, C ×
Ottenburgs, Raoul
Van Beylen, Marcel
Samyn, Celest #
Issue Date: Jan-1996
Publisher: Huthig & wepf verlag
Series Title: Macromolecular chemistry and physics vol:197 issue:2 pages:443-466
Abstract: Copolycarbonates with flexible spacers have been prepared by melt condensation of 4,4'-bis[(2-hydroxyethyl)oxy]biphenyl, 1,5-bis[(2-hydroxyethyl)oxy]naphthalene and penta-respectively octamethylene diphenyl dicarbonate in varying concentrations. These random copolycarbonates show liquid crystalline behavior, with the formation of a nematic phase over a temperature range of maximum 22 degrees C respectively 47 degrees C, this for at least 75 mol-% of biphenyl units. Incorporation of 1,5-bis[(6-hydroxyhexyl)oxy]naphchalene does not lead to liquid crystallinity. Copolymers with 2,6-bis[(6-hydroxyhexyl)oxy]naphthalene and 4,4'-bis[(6-hydroxyhexyl)oxy]biphenyl show mesomorphic behavior, with the formation of a mesophase with a maximum width of 20 degrees C, for incorporation up to 75 mol-% of either of the mesogenic units. Copolycarbonates which contain only biphenyl mesogenic units and which differ in the length of the flexible spacers were also obtained; they behave liquid crystalline over the entire composition range with maximum 34 degrees C for the nematic phase region.
ISSN: 1022-1352
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Chemistry - miscellaneous
Division of Geology
× corresponding author
# (joint) last author

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