Synthesis of cyclolinear polymethylsiloxanes with two reactive groups and liquid-crystalline polymers on their basisстатья
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Дата последнего поиска статьи во внешних источниках: 19 декабря 2016 г.
Аннотация:Cyclolinear polymethylsiloxanes with reactive vinyl groups at the silicon atoms in the fragment SiO(3/2) have been synthesized for the first time by heterofunctional polycondensation of [2,6(2,8)-dichloro-2,6(2,8)-divinyl] methylcyclotetra(hexa)siloxanes with the corresponding dihydroxy derivatives. Their hydrosilylation with chlorodimethylsilane gives rise to cyclolinear polymers with 2-chlorodimethylsilylethyl substituents, hydrolysis of which leads to the corresponding hydroxy derivatives. Liquid-crystalline polymers with mesogenic cyanobiphenyl groups have been synthesized by hydrosilylation with (4'-cyanobiphenyl-4-yl) 11-(1,1,3,3-tetramethyldisiloxanyl) undecanoate. The structures of the polymers obtained have been studied by (1)H and (29)Si NMR and IR spectroscopy, GPC, viscometry, X-ray diffraction, and polarization optical microscopy.