Abstract
A comparative study of frequency domain dielectric relaxation in the SmA phase proper and in the TGB-like amorphous state (the 'isotropic smectic phase') is reported for two chiral photochromic copolymethacrylates. The phason mode of the helical TGB phase has been detected, and photoinduced ordering effects have been observed by dielectric methods. Temperature dependent dielectric measurements show Vogel-Fulcher behaviour on both heating and cooling cycles. A molecular relaxational mode with activation energy 1.04 eV was calculated from the Arrhenius plot in the higher temperature region of the SmA phase.
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