Abstract
Polypyrroles having a mesogenic side chain at the N-position were synthesized from corresponding 2,5-dibromopyrrole by dehalogenative polycondensation with Ni(cod) 2 . The mesogenic side chains were modified by combination of four different mesogenic cores, i.e., biphenyl ether, cyclohexylphenyl, oxobiphenyl, and cyanobiphenyl, with two methylene spacers, i.e., hexamethylene and decamethylene. Most polymers showed stable enantiotropic smectic phases that was identified from textures observed by polarizing optical microscopy and from XRD investigations in the liquid crystalline state. Effect of the mesogenic cores and the spacer on liquid crystallinity of the polymers was investigated by comparing properties of the mesophases. Polymers having a polar mesogenic core tended to form large domains in the liquid crystalline state. The decamethylene spacer longer than hexamethylene contributed for appearance and stabilization of a highly-ordered mesophase.
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