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Studies on the electromagnetic interference shielding effectiveness of metallized PVAc‐AgNO 3 /PET conductive films
Author(s) -
Huang ChuehJung,
Chang TehChou
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12949
Subject(s) - materials science , electromagnetic shielding , conductive polymer , composite material , aqueous solution , electrical resistivity and conductivity , scanning electron microscope , polymer , analytical chemistry (journal) , nuclear chemistry , chemistry , electrical engineering , chromatography , engineering
A metal chelate polymer (MCP) of PVAc‐AgNO 3 was prepared by adding AgNO 3 salts into the PVAc matrix and was coated on to PET substrate to form PVAc‐AgNO 3 /PET films. These films were then treated with NaBH 4 aqueous solution to become the reduced metallized conductive films (RMCF) of PVAc‐AgNO 3 /PET. The electromagnetic interference shielding effectiveness (EMI/SE) and the characteristics of these films were investigated. The SE value was measured by the far‐field transmission line method. The surface resistivity (Rs) of RMCF with a AgNO 3 content of 15 wt % was found to be below 5 Ω/sq, and the SE value exceeded 20 dB over the frequency range 50–900 MHz. The Rs of RMCF with a AgNO 3 content of 30 wt % was less than 1 Ω/sq, and the SE value even reached 33 dB at 550–650 MHz. It was confirmed by X‐ray and scanning electronmicroscope (SEM) analysis that the conducting network, as formed by closely deposited silver atoms on the reduced coating surface, was the dominant pathway for effective electron propagation that contributed to the excellent conductivity of these RMCF (PVAc‐AgNO 3 /PET). © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 270–273, 2004