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KMID : 1102020170470030121
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Applied Microscopy
2017 Volume.47 No. 3 p.121 ~ p.125
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Investigations of Temperature Effect on the Conduction Mechanism of Electrical Conductivity of Copolymer/Carbon Black Composite
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Hasnaoui M. El
Kreit L.
Costa L. C.
Achour M. E.
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Abstract
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This study deals the prediction of temperature effect on low-frequency dispersion of alternating current (AC) conductivity spectra of composite materials based on copolymer reinforced with carbon black (CB) particles. A sample of ethylene butylacrylate loaded with 13% of CB particles were prepared and investigated using the impedance spectroscopy representation in the frequency range from 40 Hz to 0.1 MHz and temperature range from 20°C to 125°C. The dielectric constant, ?′, and dielectric losses, ?″, were found to decrease with increasing frequency. The frequency dependence of the AC conductivity follows the universal power law with a large deviation in the high frequency region, the positive temperature coefficient in resistivity effect has been observed below the melting temperature which makes this composite potentially remarkable for industrial applications.
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KEYWORD
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Copolymer composite, Carbon black, Jonscher’s power law, Permittivity, Positive temperature coefficient of resistivity effect
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