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Synthesis of side‐chain liquid‐crystalline polysalts with a poly(methylsiloxane) backbone
Author(s) -
Ikker Andreas,
Frère Yves,
Masson Patrick,
Gramain Philippe
Publication year - 1994
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.1994.021951206
Subject(s) - side chain , mesogen , polymer chemistry , hydrosilylation , chemistry , alkyl , alkoxy group , differential scanning calorimetry , hydroxymethyl , polymer , bromide , pyridine , organic chemistry , liquid crystalline , physics , thermodynamics , catalysis
The synthesis and thermal properties of side‐chain liquid‐crystalline polysiloxanes, incorporating quaternized pyridyl groups, are described. The polymers are obtained by hydrosilylation of poly(hydrogenmethylsiloxane) with a protected alcohol. Reaction of the deprotected polysiloxanes with 4‐(hydroxymethyl)pyridine and subsequent reaction with mesogenic alkyl bromides of different structure yielded the desired poly[(6‐{ N ‐[ω‐(4′‐alkoxy‐4‐biphenylyloxy)alkyl]‐4‐pyridiniomethoxy}hexyl)methylsiloxane bromide]. Four different types of polymers are prepared with either octyl or dodecyl alkyl chain, and with either methoxy or S ‐2‐methyl‐1‐butoxy as an alkoxy group. Degrees of quaternization up to 80% are obtained. First results of their liquid‐crystalline behaviour investigated by optical polarizing microscopy and differential scanning calorimetry are reported.