Abstract
A series of new ferroelectric liquid crystal (FLC) copolymers based on a photocrosslinkable ferroelectric liquid crystal was synthesized. Chemical structures were analyzed by 1H NMR and FT-IR spectroscopy. Liquid crystal phases of these photocrosslinkable materials were characterized by differential scanning calorimetry, optical polarizing microscopy, and X-ray diffraction measurements. A wide temperature range of chiral smectic (S*C) phase (approximately 100°C) was found for the monomer and its copolymers. Microscopic phase separation was observed when the graft ratios of the FLC monomer were 15%, 35%, and 55%. Dielectric relaxation behavior of the ferroelectric liquid crystal copolymers was investigated by broadband dielectric relaxation spectroscopy. As the graft content of liquid crystal decreased, the relaxation intensity and frequency of the S*C phase increased. The relationship between thermal dynamics and chemical structure was also discussed.
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