Aromatic side-chain liquid-crystalline polyurethanes with azobenzene mesogenic units (CROSBI ID 228338)
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Podaci o odgovornosti
Brecl, Marko ; Ambrožić, Gabriela ; Žigon, Majda
engleski
Aromatic side-chain liquid-crystalline polyurethanes with azobenzene mesogenic units
We have synthesized SC-LCPUs from 1, 1'-methylenebis(4-isocyanatobenzene) (MDI) and azobenzene mesogenic diols (alpha-[bis(2-hydroxyethyl)amino]-omega-(4-R-azobenzene-4'-oxy)alkanes, R = -OCH3, -CN and -NO2) with 4, 8 or 12 methylene spacer units. All the C4RMDIP are amorphous polymers showing no mesomorphic properties, whereas for C8RMDIP polyurethanes only C8OMeMDIP is liquid-crystalline. The smectic structures of C12RMDIP polymers are defined by the terminal group ; the layer spacing values give the order CN>NO2>OMe.
liquid-crystals ; polymer ; polyurethane ; synthesis
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