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Dielectric properties of multiwall carbon nanotube-red silicone rubber composites

A. PANTAZI1, S. PALADE1, C. BERBECARU1,2,* , M. PURICA3, A. MATEI3, O. OPREA4, D. DRAGOMAN5,6

Affiliation

  1. Faculty of Physics, University of Bucharest, P.O. Box MG-11, 077125 Bucharest, Romania
  2. Romanian Materials Science-Crystal Growth Society, 077125 Bucharest-Magurele, Romania
  3. National Research and Development Institute in Microtechnologies, Str. Erou Iancu Nicolae 126 A, 077190 Bucharest, Romania
  4. Faculty of Applied Chemistry and Materials Science, University “Politehnica” Bucharest, 1-7 Polizu Str., 011061 Bucharest, Romania
  5. Faculty of Physics, University of Bucharest, P.O. Box MG-11, 077125 Bucharest, Romania bNational Research and Development Institute in Microtechnologies, Str. Erou Iancu Nicolae 126 A, 077190 Buchare
  6. Academy of Romanian Scientists, Splaiul Independentei 54, 050094 Bucharest, Romania

Abstract

Composites with different mass concentrations of carbon nanotubes in red silicone rubber (MWCN-RSR) were prepared. Both Raman and Fourier Transform Infrared spectroscopy investigations show shifted peaks of composites related to RSR peaks and reveals weak interactions between RSR and MWCNT. Dielectric measurements on large temperature and frequency ranges in cooling-heating cycle show reproducible and almost linear decreases of permittivity with the temperature increases for RSR. Permittivity of composites shows higher values increasing the nanotubes concentrations and decrease with temperature increase with non-reproducible values above room temperature in a heating-cooling cycle. Combined effects of segmental mobility increase of polymers with increasing temperature, thermal expansion and pores in materials could explain this behavior. Losses show non-uniform and non-reproducible temperature behaviour for MWCNTRSR composite, having an overall increase with nanotube concentration. This can originate in some relaxations mechanisms in the samples, the effect of aggregates and rearrangements within the polymers structure and in the damage of nanotubes. Thermogravimetric investigations show a good mass stability of samples over investigated temperature range. Differential Scanning Calorimetry measurements revealed a weak endothermic effect suggesting some structural rearrangements in the samples. Generally permittivity and losses shows weak frequency dependence for RSR, but for composites dielectric constant show slow decreasing values with the frequency increase..

Keywords

Composite materials, Dielectric properties, Fourier transform infrared spectroscopy, Raman spectroscopy and scattering.

Submitted at: Aug. 27, 2014
Accepted at: Sept. 9, 2015

Citation

A. PANTAZI, S. PALADE, C. BERBECARU, M. PURICA, A. MATEI, O. OPREA, D. DRAGOMAN, Dielectric properties of multiwall carbon nanotube-red silicone rubber composites, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 9-10, pp. 1319-1324 (2015)