Nanocarbon broadband analysis, temperature dependent dielectric properties and percolation thresholds

Author

Bellucci, Stefano ; Macutkevic, J. ; Kuzhir, P.P. ; Paddubskaya, A. ; Maksimenko, S.A. ; Cataldo, A. ; Micciulla, F. ; Banys, J.

Author_Institution

INFN-Lab. Naz. di Frascati, Frascati, Italy

fYear

2013

fDate

9-13 Sept. 2013

Firstpage

536

Lastpage

539

Abstract

The results of a broadband dielectric investigation of multi-walled CNT (MWCNT)/epoxy resin composites in wide temperature range from room temperature to 450 K are reported. Far below the percolation threshold (0.25 wt% MWCNT) the dielectric properties of the composite are mostly determined by alpha relaxation in pure polymer matrix. Close to the percolation threshold the composite shows the negative temperature coefficient (NTC) effect in the temperature region, where the pure polymer matrix becomes conductive. The activation energy increases with the MWCNT concentration far below the percolation threshold and decreases close to it (1.5 wt% MWCNT). The dielectric analysis of the MWCNT/epoxy resin reveals a significant influence of the polymer matrix on the temperature dependence of composite dielectric properties.

Keywords

carbon nanotubes; dielectric relaxation; electrical conductivity; filled polymers; nanocomposites; percolation; permittivity; resins; C; MWCNT-epoxy resin composites; activation energy; alpha relaxation; conductive matrix; dielectric analysis; multiwalled CNT; nanocarbon broadband analysis; negative temperature coefficient; percolation thresholds; pure polymer matrix; temperature 293 K to 450 K; temperature dependent dielectric properties; Conductivity; Dielectrics; Epoxy resins; Permittivity; Polymers; Temperature; Temperature dependence;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetics in Advanced Applications (ICEAA), 2013 International Conference on

Conference_Location

Torino

Print_ISBN

978-1-4673-5705-0

Type

conf

DOI

10.1109/ICEAA.2013.6632295

Filename

6632295