Polarization Processes of Nanocomposite Silicate-EVA and PP Materials

DOI Web Site Web Site 48 References
  • Montanari Gian Carlo
    DIE-LIMAT, Dept. of Electrical Engineering, University of Bologna
  • Palmieri Fabrizio
    DIE-LIMAT, Dept. of Electrical Engineering, University of Bologna
  • Testa Luigi
    DIEET, Dept. of Electrical, Electronics and Telecommunications Engineering, Palermo University
  • Motori Antonio
    DICASM, Department of Applied Chemistry and Material Science, University of Bologna
  • Saccani Andrea
    DICASM, Department of Applied Chemistry and Material Science, University of Bologna
  • Patuelli Francesca
    DICASM, Department of Applied Chemistry and Material Science, University of Bologna

Search this article

Abstract

Recent works indicate that polypropylene (PP) and ethylene-vinylacetate (EVA) filled by nanosilicates may present low content of space charge and high electric strength. Investigations are being made to explain nanocomposite behaviour and characterize their electrical, thermal and mechanical properties. In this paper, the results of broad-band dielectric spectroscopy performed on EVA and PP filled by layered nanosized silicates are reported. Isochronal and isothermal curves of complex permittivity, as well as activation energies of the relaxation processes, are presented and discussed. Nanostructuration gives rise to substantial changes in the polarisation and dielectric loss behaviour. While the relaxation process of EVA, associated with glass transition of the material amorphous phase, results unchanged from base to nanostructured material, nanocomposites EVA and PP have shown the rise of a new process at higher temperatures respect to the typical host material processes, as well as a different distribution of relaxation processes. Changes in space charge accumulation in relation to the effectiveness of the purification process performed upon nanostructured materials are also reported: while the dispersion of the clean clays leads to a reduction of the space charge, especially at high fields, an unclean filler gives rise to significant homo-charge accumulation and interfacial polarisation phenomena.

Journal

References(48)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top