LUMINITA MARIN, ADINA ARVINTE MESOMORPHIC COMPOUNDS CONTAINING CHROMOPHORIC MESOGENS FOR OPTO-ELECTRONIC APPLICATIONS Two compounds containing mesogenic cores based on dithiophene and dithienothiophene or fluorene units and hexyl end groups have been synthesized and their thermotropic properties were studied. The mesomorphic behaviour has been analyzed in the thermal stability range, by three complementary methods: polarized light microscopy, differential scanning calorymetry and variable temperature wide angle X ray diffraction. It was established that both compounds form a mesophase at low temperature, whose architecture depends by the mesogen molecular structure. By thermal treatment of the compounds in the mesophase stability range continuous ordered films have been obtained.
Keywords: liquid crystal, internal plasticizer, ordered film