Synthesis, characterization of polyaniline/BaFe12O19 composites with microwave-absorbing properties

Polyaniline/BaFe12O19 (PANI/Ba ferrite) composites were synthesized by in situ polymerization at different aniline/Ba ferrite weight ratios (Ani/Ba ferrite = 1/2, 1/1and 2/1) and introduced into epoxy resin to be microwave absorber. The spectroscopic characterizations of the formation processes of PANI/ Ba ferrite composites were studied using Fourier transform infrared, ultraviolet- visible spectrophotometer, X ray diffraction, scanning electronmicroscopy, transmission electronmicroscopy and electron spin resonance. Microwave-absorbing properties were investigated by measuring complex permittivity, complex permeability and reflection loss in the 2-18 and 18-40 GHz microwave frequency range using the free space method. The results showed that a wider absorption frequency range could be obtained by adding different polyaniline contents in Ba ferrite. (C) 2010 Elsevier B.V. All rights reserved.