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Single‐walled carbon nanotube/poly(methyl methacrylate) composites for electromagnetic interference shielding
Author(s) -
Das Narayan Ch.,
Liu Yayong,
Yang Kaikun,
Peng Weiqun,
Maiti Spandan,
Wang Howard
Publication year - 2009
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.21384
Subject(s) - materials science , composite material , carbon nanotube , percolation threshold , electromagnetic shielding , nanocomposite , methyl methacrylate , electrical resistivity and conductivity , poly(methyl methacrylate) , percolation (cognitive psychology) , shielding effect , microwave , polymer , polymerization , physics , engineering , quantum mechanics , neuroscience , electrical engineering , biology
Single‐walled carbon nanotube (SWNT)/poly(methyl methacrylate) (PMMA) composites were prepared using coagulation method. The electrical conductivity and the electromagnetic interference (EMI) shielding of SWNT/PMMA composites over the X‐band (8–12 GHz) and the microwave (200–2000 MHz) frequency range have been investigated. The electrical conductivity of composites increases with SWNT loading by 13 orders of magnitude, from 10 −15 to 10 −2 Ω −1 cm −1 with a percolation threshold of about 3 wt% SWNTs. The effect of the sample thickness on the shielding effectiveness has been studied, and correlated to the electrical conductivity of composites. The data suggest that SWNT/PMMA composites containing higher SWNT loading (above 10 wt%) be useful for EMI shielding and those with lower SWNT loading be useful for electrostatic charge dissipation. The dominant shielding mechanism of SWNT/PMMA composites was also discussed. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers