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Electromagnetic radiation shielding by composites of conducting polymers and wood
Author(s) -
Sapurina Irina,
Kazantseva Natalia E.,
Ryvkitalia G.,
Prokeš Jan,
Sáha Petr,
Stejskal Jaroslav
Publication year - 2004
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.21240
Subject(s) - composite material , materials science , polyaniline , polypyrrole , conductive polymer , composite number , percolation threshold , conductivity , electromagnetic shielding , dielectric , polymerization , polymer , electrical resistivity and conductivity , chemistry , optoelectronics , engineering , electrical engineering
Polyaniline or polypyrrole composites with fir or oak wood have been prepared by in situ polymerization of the corresponding monomers in an aqueous suspension of wood sawdust. The percolation threshold of compressed coated particles is located below 5 wt % of the conducting component and, above this limit, the conductivity of most composites was higher than 10 −3 S cm −1 . The conductivity of composites containing ca 30 wt % of conducting polymer was of the order of 10 −1 S cm −1 , an order of magnitude lower than that of the corresponding homopolymers, polyaniline and polypyrrole. The conductivity stability has been tested at 175°C. The polypyrrole‐based composites generally lasted for a longer time than pyrrole homopolymers, also on account of the improved mechanical integrity of the samples provided by the presence of wood. The reverse order was found with polyaniline composites. The dielectric properties of the composites were determined in the range of 100 MHz–3 GHz, indicating that thick layers of composite material, ∼ 100 mm, are needed for the screening of the electromagnetic radiation below −10 dB level in this frequency range. Nevertheless, considering the potential production cost of composites and their low weight, such composite materials could be of practical interest in the shielding of electromagnetic interference. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 807–814, 2005