Shielding and Dielectric Properties of Sulfonic Acid-Doped pi-Conjugated Polymer in 8.2-12.4 GHz Frequency Range

摘要

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 (SEA) were calculated using S-parameter obtained from the vector network analyzer in 8.2-12.4 GHz frequency range. Maximum SEA Of 26 dB (>99%) was achieved for polymer sample. The real part epsilon' of complex permittivity shows small variation, whereas the imaginary part epsilon '' is found to decrease with the increase in frequency. Different formulations have been performed to see the effect of monomer to decrease 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.