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Dielectric properties of a novel high absorbing onion-like-carbon based polymer composite |
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| Authors: | 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 |
| Affiliation: | 1. Semiconductor Physics Institute, A. Gostauto g. 11, LT-01108 Vilnius, Lithuania;2. Institute for Nuclear Problem, Bobruiskaia 11, Minsk 220030 Belarus;3. University of Vilnius, Sauletekio al. 9, LT-00122 Vilnius, Lithuania;4. Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk, 630090, Russia;5. International Technology Center, Raleigh, NC 27715, USA;6. FUNDP — University of Namur, Physics Department, 61 rue de Bruxelles, 5000 Namur, Belgium |
| 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). |
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