Thermal Properties of Ionic Liquid Crystalline Copolymers and their Nonionic Family

Abstract

Ionic liquid crystalline copolymers and their nonionic family were synthesized. The thermal and orientational properties of these ionic and nonionic families were examined. Moreover, the effects of the ionic groups for the liquid crystal formation were investigated. The nonionic liquid crystalline copolymer formed only a nematic phase with a schlieren texture. The ionic liquid crystalline copolymers exhibited only a smectic A phase due to ionic interactions between ammonium cations and counter anions. A smectic A layer was composed of ionic and nonionic sublayers, which are formed by the hydrophilic ionic groups and the hydrophobic mesogenic side chains, respectively. The thermal stability of the smectic A phase was enhanced by an ionic aggregation.

Fast thermally-responsive azatriphenylene ionic discotic liquid crystalline polymers with shape-memory properties

“…[7][8][9][10][11][12][13][14] Most of the investigated ILCPs are based on rodshaped mesogens and primarily form smectic and nematic phases. [15][16][17][18][19] For example, Ujiie et al 20 investigated the synthesis of ILC copolymers via quaternary amination reactions involving nonionic counterparts and hydrobromic acid. The resulting ILC copolymers exhibited a smectic A phase, whereas the nonionic portion exclusively formed a nematic phase with a schlieren texture.…”