Abstract
ABSTRACT The orientational order ofsome nematogenic low molecular liquid crystals and three polymers with mesogenic side groups has been studied using - host effect. The polarized absorption and fluorescence spectra of the fluorescent guest probe oriented in the liquid crystalline matrices have been measured as a function of the temperature in the nematic phase. From the experimental data the order parameters and as well as the molecular distribution function have been determined. The small differences between the molecular orientation in the low molecular liquid crystals and the side chain polymers have been observed. It has been also found, that the orientational order depends strongly on themolecular structure ofthe mesogenic molecules.Keywords: order parameter, nematic liquid crystal, liquid crystalline polymer, absorption, fluorescence 1. INTRODUCTIONThe phenomenon of the orientation of dichroic dye molecules doped as guests to nematic liquid
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