Abstract
Poly(trimethylene terephthalate) (PTT)/multiwalled carbon nanotube (MWCNT) composites have been fabricated to evaluate the potential of PTT composites as electromagnetic interference (EMI) shielding material. The room temperature electrical conductivity, complex permittivity, and shielding effectiveness (SE) of PTT/MWCNT composites were studied in the frequency range of 8.2–12.4 GHz (X-band). The dc conductivity (σ) of composites increased with increasing MWCNT loading and a typical percolation behavior was observed at 0.48 vol% MWCNT loading. The highest EMI SE of PTT/MWCNT composites was ~23 decibel (dB) at 4.76 vol% MWCNT loading which suggest that these composites can be used as light weight EMI shielding materials. The correlation among the SE, complex permittivity, and electrical conductivity was also studied. The EMI shielding mechanism of PTT/MWCNT composites was studied by resolving the total EMI SE into absorption and reflection loss.
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Acknowledgements
University Grants Commission (for providing financial assistance to one of the authors Ms. Anju Gupta), National Physical Laboratory (for EMI shielding and conductivity measurements), and Advanced Instrumental Research Facility at Jawaharlal Nehru University Delhi (for TEM) are gratefully acknowledged.
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Gupta, A., Choudhary, V. Electrical conductivity and shielding effectiveness of poly(trimethylene terephthalate)/multiwalled carbon nanotube composites. J Mater Sci 46, 6416–6423 (2011). https://doi.org/10.1007/s10853-011-5591-8
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DOI: https://doi.org/10.1007/s10853-011-5591-8