ISESCO JOURNAL of Science and Technology
The Official Journal of ISESCO Centre for Promotion of Scientific Research

Abstract

The present paper addresses the technology of formation of quantum nanowires PbS in a polypropylene matrix. The structure and electro-physical properties of PP+PbS synthesized nanocomposites were studied on the basis of polypropylene films irradiated and non irradiated by accelerated heavy Xe ions. The structure and morphology of quantum nanowires of PbS in a polymeric matrix were studied by scanning electron microscopy and atom-force microscopy. The size of the PbS nanowires in the polypropylene was established at 12-13 nm. The electro physical properties of PP+PbS nanocomposites were also studied. It was found that the variation of dielectric permittivity of the nanocomposite versus frequency is negligible. However, the dielectric permittivity of PP+PbS nanocomposites on the basis of PP irradiated by heavy Xe ions at different time intervals decreases as a function of the gas discharge duration. At lower concentrations, the PbS nanoparticles play the role of a structurant in the polymeric matrix. As a result, polar groups, as well as stable electrical traps for electric charges, are created in the obtained nanocomposites, leading to the increased dielectric permittivity or improvement of the polarizability of these materials. Since nanoparticles themselves behave as individual disperse phases and structurants, the further increase of concentration caused their dielectric permittivity to become larger than that of pure polypropylene. However, the dielectric permittivity of polymer is decreased when its electrical conductivity increases.

Keywords: Heavy ions, Lead sulphide, Nanoparticle, Polymeric nanocomposite, Quantum nanowiress.