A. Ikker et al., SYNTHESIS OF SIDE-CHAIN LIQUID-CRYSTALLINE POLYSALTS WITH A POLY(METHYLSILOXANE) BACKBONE, Macromolecular chemistry and physics, 195(12), 1994, pp. 3799-3811
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(hydrogenmethyls
iloxane) with a protected alcohol. Reaction of the deprotected polysil
oxanes with 4-(hydroxymethyl)pyridine and subsequent reaction with mes
ogenic alkyl bromides of different structure yielded the desired xy)al
kyl]-4-pyridinio-methoxy}hexyl)methylsiloxane bromide]. Four different
types of polymers are prepared with either octyl or dodecyl alkyl cha
in, 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 th
eir liquid-crystalline behaviour investigated by optical polarizing mi
croscopy and differential scanning calorimetry are reported.