Dielectric properties and electric breakdown strength of a subpercolative composite of carbon black in thermoplastic copolymer

Stoyanov, Hristiyan; Mc Carthy, Denis; Kollosche, Matthias; Kofod, Guggi
June 2009
Applied Physics Letters;6/8/2009, Vol. 94 Issue 23, p232905
Academic Journal
We investigate the dielectric properties and electric breakdown strength of subpercolative composites of conductive carbon black particles in a rubber insulating matrix. A significant increase in the permittivity in the vicinity of the insulator to conductor transition was observed, with relatively low increases in dielectric loss; however, a rapid decrease in electric breakdown strength was inevitable. A steplike feature was ascribed to agglomeration effects. The low ultimate values of the electric field strength of such composites appear to prohibit practical use.


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