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(hydrogenmethylsi1oxane) 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-[w-(4'-alkoxy-4-biphenylyloxy)alkyl]-4-pyridiniomethoxy ) hexy1)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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.