Electret-thermal analysis of dielectric objects

Abstract

The development of methodological tools for studying the most possible range of the objects of dielectric nature is an urgent task. We present the results of studying dielectric objects by the method of electret-thermal analysis (ETA). Electrophysical changes in dielectric objects were studied taking into account polarization effects and electret state. The ETA data of ultrahigh molecular polyethylene, polyvinyl alcohol, human blood, synovial fluid, starch-containing polymer biodegradable compositions, chitosan, and vegetable oils are presented. Analysis of the spectra of thermally stimulated currents obtained during tests revealed that ETA method is characterized by high information content regarding various dielectric objects.Thermally stimulated current response makes it possible to identify and interpret phase phenomena occurring upon heating of the objects, including those accompanied by electrophysical processes of transfer and relaxation of the electret charge. The results obtained can be used to improve the methodology for analyzing electrophysical changes in dielectric objects.