6533b82dfe1ef96bd1290e4d

RESEARCH PRODUCT

Nanocarbon broadband analysis, temperature dependent dielectric properties and percolation thresholds

J. MacutkevicP. P. KuzhirA. PaddubskayaS. A. MaksimenkoAntonino CataldoF. MicciullaJ. Banys

subject

Settore ING-IND/22 - Scienza E Tecnologia Dei Materialicarbon nanotubes dielectric relaxation electrical conductivity filled polymers nanocomposites percolation permittivity resinsSettore CHIM/02 - Chimica Fisica

description

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.

yearjournalcountryeditionlanguage
2013-01-01
http://hdl.handle.net/10447/105119