Abstract
Several dilute discontinuous conducting fiber composites have been fabricated, and the observed low-frequency permittivities compared with predictions of transport models. Novel fabrication techniques have been employed to produce systems of highly aligned and well-dispersed fibers. The distribution of orientations of the included phase has been determined with a digitizing image analyzer and compared to a more accurate manual method of recording of fiber positions. Dilute approximations are invoked to predict the electrical transport properties of the materials. Composite permittivity is found to be well-represented by a simple mean-field approximation for composites with a low degree of fiber aggregation. The complex permittivities of matrix polymers and composites are characterized from 1 to 1000 kHz at temperatures ranging from 80 to 440 K. Composite dielectric constants are shown only under certain conditions to be invariant with temperature and frequency when reduced by matrix resin permittivity. The use of image analysis for structural characterization of transparent matrix composites is evaluated, and some limitations identified.
Published Version
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