Study of Microwave Absorbing Properties of Polyaniline/STF Conducting Composites Prepared by <i>in Situ</i> Polymerization

Abstract

Abstract Conducting composites of polyaniline doped with dodecylbenzenesulfonic acid (PAni‐DBSA) and poly(styrene‐b‐styrene‐butadiene‐b‐styrene) (STF) as supporting matrix were prepared by in situ synthesis. The influence of composition and thickness on the electromagnetic properties and shielding effectiveness (SE) of the materials was evaluated using a microwave network analyzer and a standard rectangular waveguide from 8.2–12.4 GHz (X–band). It was found that the composition 49/51 exhibited the best SE and the higher values of reflected power (P R ), ε′, ε″ and ε*. The compositions 12/88 and 17/83 presented the higher values of transmitted power (P T ) and absorbed power (P A ), respectively. The composition 25/75 presented the higher value of tan δ. The thickness of 5× showed the best SE and higher value of P R . The higher value of transmitted power (P T ) was obtained for thickness of 1×. The values of P A were similar for all thicknesses. The thickness of 1x showed the higher values of ε′, ε″, ε* and tan δ.