Dielectric properties of a novel high absorbing onion-like-carbon based polymer composite

J. Macutkevic, P. Kuzhir, D. Seliuta, G. Valusis, J. Banys, A. Paddubskaya, D. Bychanok, G. Slepyan, S. Maksimenko, V. Kuznetsov, S. Moseenkov, O. Shenderova, A. Mayer, Ph Lambin

Research output: Contribution to journalArticlepeer-review

Abstract

A novel lightweight onion-like carbon (OLC) based Poly(methyl metacrylate) (PMMA) composite with high electromagnetic (EM) absorption capability determined earlier in microwave range is studied in low frequencies from 20 Hz to 1 MHz by dielectric spectroscopy. The investigation of dielectric properties of PMMA films with incorporated OLC in small concentration (0.5-2 wt.%) have been carried out by varying the temperature between 240 and 520 K. The temperature behavior of the complex permittivity at a given frequency is found to be strongly dependent on the OLC concentration. The experimental data are in quantitative agreement with the results of modified effective medium calculations of OLC-based polymer film's permittivity. Both the experimental observations and theoretical simulation demonstrate that small additions of onion-like carbon particles to a polymer matrix can noticeably modify the composite response to low-frequency EM radiation as well as improve its thermal stability (increased glass transition and melting temperatures, correspondingly).

Original languageEnglish
Pages (from-to)91-99
Number of pages9
JournalDiamond and Related Materials
Volume19
Issue number1
DOIs
StatePublished - Jan 2010
Externally publishedYes

Keywords

  • Dielectric permittivity
  • Electromagnetic coating
  • Onion like carbon
  • PMMA
  • Thermal stability

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