Electrical conductivity and shielding effectiveness of poly(trimethylene terephthalate)/multiwalled carbon nanotube composites |
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Authors: | Anju Gupta and Veena Choudhary |
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Affiliation: | (1) Centre for Polymer Science & Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India; |
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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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Keywords: | |
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