New cholesteric comb-shaped polymers based on (S)-(+)-1,1′-binaphthalene-2,2′-diylphosphoric acidстатья
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Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:A series of liquid-crystal copolymers was synthesized for the first time on the basis of a nematogenic phenylbenzoate acrylic monomer and a new chiral acrylic monomer obtained from an enantiomerically pure (S)-(+)-1,1′-binaphthalene-2,2′-diylphosphoric acid. It was found that copolymers containing less than 12 mol % of the above atropenantiomer form a cholesteric phase with a helical twisting power of the chiral fragment more three times that for the similar cholesterol-based copolymers. A weak temperature dependence of the helical twisting power for the chiral fragments of synthesized copolymers (in contrast to the strong temperature dependence observed for the open 1,1′-binaphthyl derivatives) was explained on the basis of molecular dynamics modeling of the conformational states for the open and closed forms of binaphthyl fragment in a liquid-crystal matrix.