Isomorphous mixing of mesogenic anions and uncharged analogues in organised poly(ehtylene oxide)‐alkali salt complexes

Publisher Website
Google Scholar
Abstract
The preparation and characterisation of novel ionic polymer liquid crystal complexes of poly(ethylene oxide)–Na+ with mesogenic anions and their uncharged structural analogues in homogeneous mixtures are described. The systems discused most fully are the anion of the phenolic mesogen 4‐n‐hexyloxybenzylidene‐4‐hydroxy aniline (1) with its uncharged analogue 4‐n‐hexyloxybenzylidene aniline (1a) and the anion of 5‐(4‐n‐octyloxy‐2,3‐dicyanophenyleneoxycarbonyl)benzimidazo‐le (2) and its uncharged analogue 4‐octyloxy‐2,3‐dicyanophenyloxybenzoyl (2). Differential scanning calorimetry, wide angle x‐ray diffraction and polarised light microscopy show that PEO–Na1/1a and PEO–Na2/2a are homogeneous mesogenic phases when Na1 or Na2 are present at 50% or less of the stoichiometric composition in complexes (EO : salt = 3 : 1) and the shortfall is made up from 1a or 2a uncharged analogues of 1a and related systems substituted by methoxy rather than hydrogen do not form homogeneous mixtures.