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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
E-mail: taldrik86@ya.ru

Abstract
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