DIELECTRIC CHARACTERIZATION OF SUBSTITUTED DIOLS

Dielectric properties of four diols having different chemical structur es of the hydrophobic part were determined by the time domain spectros copy method in the frequency range from c. 15 MHz to c. 7 GHz. The sta tic permittivity clearly reflects the changes in the position of the d ipole moments in the molecules. The dielectric relaxation times charac terizing the diol part of the molecules are similar for all the substa nces studied. In the case where the phenylthiadiazole unit is built in to the alkyl chain, two well separated processes were observed: one co nnected with the 'hydrophobic' and the second with the 'hydrophilic' p art of the molecule. This emphasizes the amphotropic character of such molecules.