Temperature-dependent resistivity and conduction mechanism in carbon particle-filled polymers

Tipo de material: Texto

TextoSeries ; Journal of Materials Science, 27(5), p.1322-1326, 1992Trabajos contenidos:

Carmona, F
Mouney, C

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Resumen: The filler-concentration dependence of the room temperature conductivity of epoxy resins filled with various carbon particles is reported: two carbon blacks differing by the particles size and short carbon fibres were used. The familiar insulator-to-conductor transitions are evidenced and analysed according to percolation theory predictions. The temperature variations below room temperature of the resistivity of selected samples are studied. Two distinct temperature dependences are shown, and interpreted as being due either to tunnelling of electrons among neighbouring particles, or to differential thermal expansion of the matrix and the particles when the latter touch one another. All these results are consistent with general results of colloidal stability theories when particle size and shearing (achieved during material processing)are taken into account.

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Previous	B-8419 Electrical conductivity of carbon black filled polymers - effects of morphology and processing	B-842 Somatic hybridisation of Petunia hybrida and P. parodii	B-8420 Electrical Resistivity of Composites	B-8421 Temperature-dependent resistivity and conduction mechanism in carbon particle-filled polymers	B-8422 Fractal approach to the critical filler volume fraction of an electrically conductive polymer composite	B-8423 Critical Volume Fractions in Conductive Composites	B-8424 Cryopreservation trials in Carica papaya	Next

The filler-concentration dependence of the room temperature conductivity of epoxy resins filled with various carbon particles is reported: two carbon blacks differing by the particles size and short carbon fibres were used. The familiar insulator-to-conductor transitions are evidenced and analysed according to percolation theory predictions. The temperature variations below room temperature of the resistivity of selected samples are studied. Two distinct temperature dependences are shown, and interpreted as being due either to tunnelling of electrons among neighbouring particles, or to differential thermal expansion of the matrix and the particles when the latter touch one another. All these results are consistent with general results of colloidal stability theories when particle size and shearing (achieved during material processing)are taken into account.

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