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Abstract
Both nonionic liquid-crystalline side-chain polymer [P(A—CH3)) and ionic family [P(A—CH3/CH3I)] of P(A–CH3) were prepared. Nonionic P(A—CH3), having an alkylamine spacer, exhibited solidsmectic and smectic-isotropic phase transitions. Ionic P(A—CH3/CH3I), having an alkylammonium spacer, showed glassy-smectic and smectic-isotropic phase transitions. Ionic P(A—CH3/CH3I) exhibited the enhanced thermal stability by the aggregation of ammonium ions formed by Coulomb's force in comparison with nonionic P(A—CH3). The enhanced thermal stability in ionic families was also concluded from experimental results obtained for nonionic and ionic low molecular weight liquid-crystalline compounds corresponding to mesogenic side groups of P(A—CH3) and P(A—CH3/CH3I).