Superiority of dielectric properties of LDPE/MgO nanocomposites over microcomposites

Kazuyuki Ishimoto*, Etsu Kanegae, Yoshimichi Ohki, Toshikatsu Tanaka, Yoitsu Sekiguchi, Yoshinao Murata, C. C. Reddy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)


Dielectric properties were compared between two kinds of low-density polyethylene (LDPE) composites prepared by adding near spherical MgO fillers with different diameters of around several ten nm and several m. In the whole range of temperature from 0°C to 90°C, the conductivity is decreased and the permittivity is increased by the addition of fillers, irrespective of their sizes. However, the decrement in the conductivity is more significant and permittivity increment is suppressed more in the case of the nm fillers. In addition, a drastic increase in dielectric loss factor, observed at low frequencies, is suppressed more significantly by the addition of the nm fillers. While the formation of packet-like charge, observed in LDPE, is suppressed by both fillers, the effect is far more significant in the nanocomposites. This means that the nano-fillers suppress the conductivity enhancement by the voltage application more effectively.

Original languageEnglish
Article number5361597
Pages (from-to)1735-1742
Number of pages8
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number6
Publication statusPublished - 2009 Dec


  • Complex permittivity
  • Conductivity
  • Magnesium oxide
  • Polyethylene insulation
  • Polymer nanocomposites
  • Space charge distribution

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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