Revenyuk T. Formation and relaxation of polarization in dielectric films of doped polystyrene.

The thesis is devoted to investigation of formation and dielectric relaxation of the polarized state in thin polymeric films of polystyrene doped with the optically active DR1 azo dye. In view of the investigated guest-host system as an example, it is shown that the relaxation processes in non-linear optical (NLO) polymers can be studied considering such polymers as polar electrets, in which the dipolar polarization interacts with surface and volume charges.The kinetics of formation of a polarized state in the samples was investigated in isothermal and thermally stimulated conditions by application of some modern experimental methods. A new modification of the thermally stimulated depolarization (TSD) method has been suggested and developed for increasing informativity and sensitivity. It is shown that the electrical principle of superposition is valid for the studied samples below glass transition temperature, while the argument was discovered for application of the concept of universal internal temperature dependent time.