Liquid-crystalline compounds 1 and 3 having perfluoroalkyl-terminated mesogens at both ends of poly(ethylene oxide) chains have been prepared. These compounds show smectic A (SA) and C phases over 100°C. The SA-Iso (isotropic) transition temperatures are higher by about 70°C than those of the corresponding alkyl-substituted compounds 2 and 4. The incorporation of lithium triflate into 1 and 3 widens the temperature ranges of the SA phases for the resulting complexes. The complexes of 1 and 3 containing 50 mol-% of lithium triflate exhibit columnar phases. The ionic conductivities of the homotropically aligned complexes based on 1 along the direction perpendicular to the molecular director of the SA phases are higher than those of the corresponding compound of 2. The increase of the ionic conductivities as well as the stabilization of the smectic phases for these perfluoroalkyl-terminated compounds may be due to the formation of more stabilized layered structures through the intermolecular interactions among the perfluoroalkyl moieties.
|Macromolecular Chemistry and Physics
|出版済み - 2002 7月 29