Abstract
We constructed polymer-dispersed liquid crystals which consisted of nematic liquid crystal 4'-n-pentil-4-cyanobiphenyl (5CB) and a ferroelectric copolymer of vinylidene fluoride and trifluoroethylene [P(VDF/TrFE)] by using a solvent-induced phase separation method. The hysteresis between the dielectric displacement and the external electric field was observed simultaneously with the electrooptical behavior in the poling process of the sample. The memory of the applied electric field appeared as a peak shift in the electrooptical dependence. This memory decayed on the order of 100 s. We consider that this decay was due to the screening of the spontaneous polarization of P(VDF/TrFE) by the redistribution of conductive charges in the crystal region of P(VDF/TrFE).
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