Abstract
The electrical birefringence (Kerr effect) in the isotropic phase of thermotropic liquid crystalline comb-like polyacrylic polymer having cyanobiphenyl groups in the side chains is studied. The presence of pretransition effects over several degrees before the temperature of transition into the nematic state in both its equilibrium electrooptical properties and in relaxation phenomena is established. On the basis of a comparison of the electrooptical properties of the polymer and its low molecular weight analogues, conclusions are arrived at on the mechanisms of motion of the polymer chain responsible for the electrical birefringence. Two mechanisms of the Kerr effect dispersion of various types and having different relaxation times and different relations with the temperature are observed.
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