Electrical field dependence of conductivity and critical exponent of it for carbon black-resin composites

Nakamura, Shuhei; Saito, Kazuhiko; Sawa, Goro

doi:10.1049/cp:19960999

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“…The behavior of the nonuniversal critical exponent of conductivity in polymer composites has been reported in literature 30,31 ; it is attributed to the formation of an electrical percolation network in which the particles are not in direct physical contact 32 . In this case, the conduction process in the composite preferentially occurs via hopping and tunneling of charge carriers between neighboring particles or particles clusters 32 . Above the percolation threshold, the electrical conductivity of the composite increased by seven orders of magnitude compared to that of neat NR (10 -14 S/cm).…”

Section: Resultsmentioning

confidence: 90%

Electrical, mechanical, and thermal analysis of natural rubber/polyaniline-Dbsa composite

et al. 2014

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A composite of natural rubber (NR) with polyaniline (PANI) was obtained by mixing an aqueous dispersion of dodecylbenzenesulfonic acid (DBSA)-doped PANI with NR latex in different concentrations. Films were obtained by the casting method and characterized by ultraviolet visible near-infrared (UV-Vis-NIR) spectroscopy, thermogravimetry/differential thermogravimetry (TG/ DTG), stress-strain testing, differential scanning calorimetry (DSC), and DC electrical conductivity measurements. The UV-vis-NIR spectrum showed that PANI remained doped in the composite, and this improved the mechanical and electrical proprieties of NR films and afforded them good thermal stability up to ~200°C. The percolation threshold did not follow the universal critical exponent, and in this case, conduction preferentially occurs by hopping and tunneling.

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