| Abstract
| - Polyanilines with liquid crystalline (LC) substituents, which consist of a flexible methylenespacer and phenylcyclohexyl moiety as a mesogenic core, were synthesized. Polymerizations wereperformed using ammonium persulfate and perchloric acid as the catalytic system. The polymers werequite soluble in organic solvents such as THF and chloroform. The polymers were characterized by IR,UV−vis, 1H NMR, and 13C NMR spectroscopies. The oxidized form of the pristine polyaniline derivativewith a liquid crystalline group and neutral form prepared by ammonia treatment were examined withrespect to the liquid crystallinity. The polymers with the longer flexible methylene spacer (n = 10) of theoxidized form and neutral form exhibited thermotropic liquid crystallinity. Phase transitions and thecorresponding enthalpy changes were evaluated using differential scanning calorimeter measurements.The smectic liquid crystallinity was characterized by fan-shaped texture through polarizing opticalmicroscope observations. The LC domains of polyaniline derivative were growing like strings and alignedparallel to the magnetic field.
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