Abstract
The phase transition behavior of monosubstituted ferrocene derivatives containing cholesteryl group as a mesogenic one, [4-[ω -(cholesteryloxycarbonyl)alkoxycarbonyl]phenyl]ferrocene (abbreviated hereafter to CAPF-n, where n is the carbon number of the flexible methylene chain), have been investigated using various methods in our laboratory. In the present study, the dynamic viscoelastic measurements for CAPF-6 were carried out as a function of frequency and temperature in the smectic C and the liquid phases. In the smectic C phase, the storage modulus(G') curves can not be superposed on to a single master curve. That is, G' curves in a lower frequency range at higher temperature deviate on the master curve, in contrast to those in a higher frequency range at lower temperature which are well superposed on to the single master curve. This fact suggests that the smectic structure changes gradually into less order at higer temperature in the smectic phase.
