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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng


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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2009, 4, 75—83.

Influence of Stereoregularity in Comb-Shaped Cyclolinear Methylsiloxane Copolymers on LC State Formation

A. V. Tal'drik, N. V. Chizhova, N. N. Makarova

Author affiliations
A. N. Nesmeyanov Institute of Organoelement Compounds. Russian Academy of Sciences
Vavilova Str. 28, 119991, Moscow, Russia

Stereoregular cyclolinear methylsiloxane copolymers were synthesized by the reaction of heterofunctional polycondensation of E or Z 2,8-dihydroxy-2,4,4,6,6,8,10,10,12,12-decamethylcyclohexasiloxanes with methyldichlorsilane and methylvinildichlorsilane. New stereoregular comb-shaped polymers with main cyclolinear chain were synthesized by the reaction of hydrosilylation of methylsiloxane copolymers with (4'-cyanobiphen-4-yl)undec-10-anoat, (4'-cyanobiphenoxy)-propylene and their HSiMe2OSiMe2-derivatives in presence of Karsted catalyst. By the NMR 1H, 29Si, IR-spectroscopy and GPC methods the structure of the main chain and side groups was confirmed. By the DSC, optic microscopy, SAXS methods the phase behavior was investigated and chain-to-chain distance of stereoregular comb-shaped cyclolinear methylsiloxane copolymers was determined.

Keywords: stereoregular cyclolinear polysiloxane, LC-polymers, comb-shaped LC polymer

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