Electret state in nanocomposites based on polylactide

The electret properties of composites based on polylactide (PLA) filled with montmorillonite (MML) have been studied. With an increase of filler content, the stability of the electret state increases, as well as the charge and amplitudes of the TSD currents. The current spectra are analyzed based on the concept of a superposition of discrete elementary Debye maxima described by first-order kinetics. The coincidence of experimental and calculated values of the current density is shown, the charge and activation energy are calculated. Low temperature maxima can be caused either by the release of charge carriers from traps localized at the interface between PLA and MML (Maxwell – Wagner polarization), or charge relaxation from traps caused by unfreezing of PLA segmental mobility.