Authors
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Valentini, M. ; Piana, F. ; Pionteck, J. ; Lamastra, F. R. ; Nanni, F.
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Title
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Electromagnetic properties and performance of exfoliated graphite (EG) - Thermoplastic polyurethane (TPU) nanocomposites at microwaves
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Date
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19.06.2015
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Number
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44408
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Abstract
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Nanocomposite materials based on commercial thermoplastic polyurethane (TPU) loaded with exfoliated graphite (EG) in concentration between 0 and 20 wt.% have been prepared with EG via melt mixing and compression molding. The materials’ electromagnetic properties have been measured with wave-guide technique between 8.2 and 12.3 GHz. They had shown a clear proportional dependence of complex permittivity with EG content. Above 16 wt.% permittivity becomes frequency dependent. These results are discussed in view of material microstructure by means of scanning electron microscope (SEM) observations. Samples, with 20 wt.% EG and 4 mm thick, show an average value of -20 dB of shielding effectiveness (SE), which make them suitable as shielding material for commercial application. Simulations of metal backed configuration showed that important narrowband EM absorption (>-15 dB) can be achieved at 1 mm thickness, while multilayer structures are necessary to obtain EM broadband absorption (>-10 dB between 8.5 and 12 GHz) can be achieved in 6 mm thick samples.
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Publisher
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Composites Science and Technology
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Wikidata
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Citation
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Composites Science and Technology 114 (2015) 26-33
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DOI
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https://doi.org/10.1016/j.compscitech.2015.03.006
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Tags
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exfoliated graphite functional composites nano composites polymer-matrix composites (pmcs) electrical properties
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