In order to reveal the important influence of the aggregate structure of conductive component to the percolation behavior of polymer-conductor composites, a percolation model, which is based on the percolation theory and the equivalent sphere of aggregate that acts as a basic cell, is proposed. A formula, describing the relationship of the conductivity and the volume fraction of conductive component, and an expression, estimating percolation threshold of the composites, are derived. Based on these expressions, the electrical conductivity and percolation threshold of some composites are predicted. The results show that the predictions are reasonably consistent with the experimental data.
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