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Static and dynamic electrical breakdown in conducting filled-polymers

✍ Scribed by L. Lamaignère; F. Carmona; D. Sornette

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
315 KB
Volume
241
Category
Article
ISSN
0378-4371

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✦ Synopsis

The electrical resistance of a percolating medium made of a polymer filled with conductive particles may undergo a steep increase over a narrow temperature range above room temperature. A likely mechanism for the effect is the loss of interparticle contact inducing a weakening of the connectivity of the medium as temperature is increased. When Joule 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 reached; 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.

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