Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 210, Issue 11, Pages 2491-2498Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201329254
Keywords
chemical vapor deposition; electrical properties; polymer-matrix composites; thermal analysis
Funding
- European Social Fund under the Global Grant measure (Lithuanian team)
- EU [FP7-266529 ByNanoEra, PIRSES-2012-31861750 FAEMCAR]
- Belarusian Foundation for Basic research project BRFFI [F12Lat-007, FP7-PEOPLE-2013-IRSES-610875 NAmi-ceMC]
- Ministry of education and science of the Russian Federation [8748]
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The dielectric properties of polymethylmetacrylate (PMMA) composites filled with CVD made multiwalled carbon nanotubes (MWCNT) of different mean outer diameters (d similar to 9 nm and 12-14 nm) were investigated in the temperature range from 300 to 420 K and in a wide frequency range (20 Hz to 1 MHz). Below the percolation threshold the temperature dependence of the complex dielectric permittivity of the investigated composites is mainly caused by beta relaxation in pure PMMA matrix and the dielectric permittivity is found to be higher in composites with thicker nanotubes. The activation energy of beta relaxation increases with carbon nanotube concentration. The percolation threshold is lower in composites with both thinner and oxidized carbon nanotubes. The established influence of both the MWCNT mean outer diameter and their oxidation on the broadband dielectric characteristics can be exploited for the production of effective low-cost electromagnetic and/or antistatic coatings working at different temperatures. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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