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Shielding and dielectric properties of sulfonic acid‐doped π‐conjugated polymer in 8.2–12.4 GHz frequency range
Author(s) -
Ohlan Anil,
Singh Kuldeep,
Dhawan S. K.
Publication year - 2009
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.30806
Subject(s) - materials science , sulfonic acid , polyaniline , dielectric , dopant , permittivity , polymer , dielectric loss , conductive polymer , polymer chemistry , polymerization , analytical chemistry (journal) , doping , chemical engineering , composite material , organic chemistry , chemistry , optoelectronics , engineering
This article deals with dielectric and electromagnetic interference shielding properties of the polyaniline doped with dodecyl benzene sulfonic acid (DBSA) synthesized by microemulsion polymerization of aniline in aqueous solution of DBSA. Dielectric constant and shielding effectiveness due to absorption (SE A ) were calculated using S ‐parameter obtained from the vector network analyzer in 8.2–12.4 GHz frequency range. Maximum SE A of 26 dB (>99%) was achieved for polymer sample. The real part ε′ of complex permittivity shows small variation, whereas the imaginary part ε″ is found to decrease with the increase in frequency. Different formulations have been performed to see the effect of monomer to dopant ratio on intrinsic properties of polyaniline. Further characterization of polymer was carried out by UV–visible and thermal gravimetric analysis, whereas the conductivity measurements were carried out by the four‐probe method.© 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010