Structure of percolating carbon black fractal aggregates dispersed in a polymer

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Abstract
The structure of the clusters of primary carbon black aggregates dispersed in a polymer matrix is studied by small angle neutron and X-ray scattering. The fractal dimension is found to decrease continuously for increasing concentration Φ of carbon black from D=1.75 at Φ=0, corresponding to the value for the isolated primary aggregates, to 1.5 in the considered concentration range where a percolation takes place. This result suggests a “tip-to-tip” sticking mechanism which leads to more open structures than the diffusion-limited cluster-cluster aggregation model

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