Résumé
The results of broadband dielectric spectroscopy of onion-like carbon (OLC) based Poly(methyl methacrylate) (PMMA) composites are reported in wide temperature range 300-450 K. The dielectric properties of OLC/PMMA composites are chiefly dependent on the preparation technique, in particular annealing above the glass transition temperature of composite with 20 wt.% of OLC inclusions causes the vanishing of β relaxation, electrical conductivity appearance and onset of percolation. The percolation threshold in OLC/PMMA composites is found to be close to 20 wt.%. Below the percolation threshold the dielectric properties of composites in temperature range 300-420 K are determined mainly by β relaxation. The activation energy of such a relaxation is weakly dependent on OLC concentration.
langue originale | Anglais |
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Pages (de - à) | 1201-1206 |
Nombre de pages | 6 |
journal | Nanoscience and Nanotechnology Letters |
Volume | 5 |
Numéro de publication | 11 |
Les DOIs | |
Etat de la publication | Publié - 1 nov. 2013 |