The influence of a complex filler system on the electrical properties of a microfibrillar conductive polymer composite (MCPC) is discussed. By adding insulating filler, nano-CaCO3, to carbon black (CB)-filled MCPC, the morphology of the poly(ethylene terephthalate) (PET) microfibrillar phase was tailored according to the ratio of CB/nano-CaCO3, and so were the electrical properties of MCPC. It was found that nano-CaCO3 did not influence electrical properties in a monotone way. With an increase in nano-CaCO3 content, on one hand, the surface of the microfibrils became smoother, which jeopardized the conductivity of the MCPC. At the same time, the nano-CaCO3 particles substituted for the CB particles on the surface of the microfibrils and further decreased conductivity. On the other hand, longer and better-defined microfibrils could form, which enhanced the conductive network and increased the conductivity of the MCPC. As a result, the percolation threshold changed little compared to the common CB-filled MCPC.
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Li et al. (2008) studied this question.
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