ELECTROOPTICAL PROPERTIES OF A DISUBSTITUTED AROMATIC POLYESTER IN MIXED-SOLVENTS

Study of the electrooptical properties of a disubstituted p-aromatic p olyester showed that an effective ''electrooptical'' dipole of a polym er chain is formed in polar solvents due to the orientational correlat ion between the polar groups of a macromolecule and the dipoles of sol vent molecules. This leads to a change in the effective dipole of a po lymer chain and transforms the small-scale mechanism of reorientation of macromolecule in an electric field into a large-scale one. It is fo und that a rise in the longitudinal constituent of macromolecular dipo le due to the polar properties of a medium shows a threshold pattern. This effect is observed when the solvent permittivity is above five.