THERMOSTIMULATED DEPOLARIZATION EFFECT OF COMPOSITE MATERIALS WITH HDPE+TlInSe2 and HDPE+ x vol.%TlInSe2 <Al+0.1%Sc>

Abstract

Background: The thermally stimulated current depolarization (TSD) method is known to be a powerful tool for studying relaxation processes in polymer electrets. In the present work the influence of semiconductor filler - TlInSe2 compound and aluminium-scandium nanoparticles on the character of thermal stimulated depolarization (TSD) spectra of composite materials HDPE+TlInSe2 and HDPE+ x vol.%TlInSe2 + y vol.%Al+0.1%Sc in the temperature range 293¸543K was studied. Materials and Method: The result of the investigation of characteristics of TSD currents of HDPE + TlInSe2 and HDPE+xvob.%TlInSe2 + y vob.%Al+0.1%Sc compositions has shown that on TSD curves a number of depolarization peaks are observed in the areas of temperatures related to the  release of charges from traps of bound components (PE and TlInSe2) as well as those formed by interphase polarization in the field of bulk charges. Results: The thickness of the interfacial layer in polymer mixtures was determined. The choice of high-density polyethylene (HDPE) as a binder is due to the good knowledge of the electrophysical properties of this material and the fact that HDPE in the oriented state exhibits stability of the electret effect. Conclusion:  New generation composites with aluminium-scandium additives are promising materials in various fields of nanotechnology, potentially effective in various industries. Due to a good combination of electret, strength, plastic, corrosion properties, these composites have certain prospects in the automotive, aircraft and aerospace industries. The study revealed that the introduction of a filler into the polymer matrix leads to the appearance of deep carrier capture centers; the number of traps of injected charges during corona and the depth of their occurrence increases. Under the influence of aluminum-scandium nanoparticles, the TSD current is stabilized to the melting temperature of the composite matrix. The addition of aluminum-scandium improves not only the mechanical, but also the thermal and electrical properties. Due to its large active surface, hardness, and geometric shape, aluminum-scandium provides the necessary connection between the components of the nanocomposite.