ENERGETIC STUDY OF SOME CHOLESTERYL CARBAMATES

摘要

The results obtained by combustion calorimetry, differential scanning calorimetry and thermomicroscopy of some choleseryl carbamates are reported. Thermomicroscopy allowed the crystals visualization and step- by -step transfrmation from the crystal to isotrop liquid. The study put in evidence the influence of radicals (Br. Cl. CH_3) on determinated thermodynamic parameters. This is an interesting criterion concerning the mesogen cholesteryc liquid crystal property, which depends on the electronic structure and polarizability. The results are important because the substance Ⅰ― Ⅲ have liquid crystal properties with industry applicability.