Research Information System
International Journal of Polymer Analysis and Characterization, 2025 (SCI-Expanded)
Composites based on polypropylene and ZrO2 nanoparticles (concentration of 3 vol.%), at which the highest electret properties are observed, are studied by the thermally stimulated depolarization (TSD) current method after treatment of electrostatic field with different intensities (5·106 V/m,107 V/m and 1.5·107 V/m). The measurement of TSD currents revealed the presence of two main peaks in the spectra of the nanocomposite at 25–35 °C and 120–140 °C. They appear as a result of the destruction of one or another category of traps of injected charges. Calculations have shown that there is a monomolecular mechanism of charge recombination in these nanocomposites. It is shown that increasing the applied electric field leads to an increase in the intensity of the thermograms, reaching a maximum at 107 V/m and then decreasing at 1.5·107 V/m. The activation energy, the total accumulated charge, and the relaxation time have a similar behavior. It is due to the increase in injected charges. The formation of an internal electric field prevents this process when the external electric field intensity is higher.