Shielding-effectiveness modeling of carbon-fiber/nylon-6,6 composites

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Department of Chemical Engineering; Department of Electrical and Computer Engineering


We have formulated a linear theory for the shielding effectiveness of composite matrix materials and have tested the theory for various amounts of Thermal-Graph DKD χ carbon fiber within nylon 6,6. The theory predicts that the most important parameters for the shielding effectiveness of a sample are the carbon-fiber volume percentage and the frequency of the wave to be shielded. Although we expected the model to be valid at low filler-loading levels, it actually performs remarkably, covering an electrical-resistivity range of 10 16 (at low filler-loading lev els) to 10 1 Ω cm (at high filler-loading levels), well above the percolation threshold of electrical-resistivity theory. The model performs much better than those reported in the literature and can be used to determine filler loadings needed to provide a certain level of shielding of electromagnetic waves.

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Journal of Applied Polymer Science