Electrical Resistivity and IR Behaviour of Metal-Free and Copper Phthalocyanine — Carbon Black Mixtures
Composite materials are an interesting area of materials science, because composites often exhibit physical properties that are unlike those of their component materials. The electrical properties of carbon black polymer composites are very intriguing, because of their unexpected behaviour in existing theories of their electrical conduction. According to these theories, charge carriers can tunnel or percolate through paths of carbon black. Percolation theory predicts a sharp change in conductance when the volume of the conductive particles in the mixture reaches a critical value called the percolation threshold. In carbon black phthalocyanine mixtures which we have studied, the change of conductance was not so sudden but was spread over a relative volume range of 1–25% wt. . Probably, the formation of special bonds between the carbon black and phthalocyanine matrix is responsible for this difference.
KeywordsElectrical Resistivity Carbon Black Percolation Threshold Conductive Particle Positive Temperature Coefficient
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