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Achieving a quantitative tool for the characterization of dispersion in composites is a challenge. Effective dielectric constant of composites varies with changes in inter-particle interactions which originate from changes in inter-particle spacing. In this respect, a novel methodology has been introduced to relate the dispersion state of composites to their effective dielectric constant. Total filler volume fraction, volume fraction of particles inside agglomerates and size of agglomerates are considered as dispersion factors which affect the effective dielectric constant. Inter-particle interactions are calculated based on the introduced dispersion factors. It is shown that the effective dielectric constant of composites increases with filler concentration and agglomeration due to increased inter-particle interactions. Growth of agglomerates size and volume fraction of particles inside the agglomerates result in further enhancement of effective dielectric constant. This increment is abrupt at percolation where the particles or agglomerates approach each other and the inter-particle interactions are pronounced. It is possible to characterize the dispersion state of a composite with given effective dielectric constant and filler volume fraction using the developed effective dielectric constant.

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