Abstract
A phenomenon of positive temperature coefficient (PTC) of electrical resistivity has been studied for an epoxy resin filled with carbon fibers (CF). An upper limit temperature of the PTC region was found to depend strongly on CF content. The greater CF content is, the higher upper limit temperature of PTC region is observed. A phenomenological model was proposed to explain the PTC effect. Cure temperature was shown to have a great influence on upper limit temperature of PTC region and resistivity value at room temperature. The current-voltage characteristics of the composites are not Ohmic in high-voltage range, implying non-graphitic mechanism of conduction. Tunneling mechanism of the conduction is supposed.
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Chekanov, Y., Ohnogi, R., Asai, S. et al. Positive Temperature Coefficient Effect of Epoxy Resin Filled with Short Carbon Fibers. Polym J 30, 381–387 (1998). https://doi.org/10.1295/polymj.30.381
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DOI: https://doi.org/10.1295/polymj.30.381
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