STATIC AND DYNAMIC ELECTRICAL BREAKDOWN IN CONDUCTING FILLED-POLYMERS

Citation
L. Lamaignere et al., STATIC AND DYNAMIC ELECTRICAL BREAKDOWN IN CONDUCTING FILLED-POLYMERS, Physica. A, 241(1-2), 1997, pp. 328-333
Citations number
13
Categorie Soggetti
Physics
Journal title
ISSN journal
03784371
Volume
241
Issue
1-2
Year of publication
1997
Pages
328 - 333
Database
ISI
SICI code
0378-4371(1997)241:1-2<328:SADEBI>2.0.ZU;2-F
Abstract
The electrical resistance of a percolating medium- made of A polymer f illed with conductive particles may undergo a steep increase over a na rrow temperature range above room temperature. A likely mechanism for the effect is the loss of interparticle contact inducing a weakening o f the connectivity of the medium as temperature is increased. When Jou le heating is used, the sample behavior depends strongly on whether a tension or current source is used. We show that in the first case, at any value of the voltage drop across the sample, a stable state is rea ched; on the contrary when a convenient exciting current is used, the sample resistance may diverge spontaneously with time. We demonstrate that most of these behaviors are compatible with the predictions of a random thermal fuse model.