Conducting Polymers for Radar Absorbing Composites

摘要

Polypyrrole (PPy) was deposited on glass fibre by oxidation (using FeCl3) in211u001ewater. The influence of synthesis conditions on the conductivity of the fabrics, 211u001estructure of the deposited layer, ageing, infrared and electromagnetic absorption 211u001eof the fabrics was studied. Depending on synthetic conditions, the thickness of 211u001ePPy-layers varied between 50 nm and microgram. The surface resistance ranged from 211u001e20 to 150,000 ohms per square. The use of 9,10-anthraquinone-2sulfonic acid as 211u001edoping agent improved the adhesion between the layer and the glass fibre, 211u001econductivity and stability. Glass fibre fabrics were also coated with a new 211u001econducting polymer, PEDT/PSS simply by dipping it in a polymer solution. The IR 211u001ereflectance of the coated fabrics with PPy and PEDT varied between 0.05 and 0.2 211u001ein the range 5000-500 cm(sup -1). The coated fabrics showed a very flat microwave 211u001eabsorption between 6-18 GHz with an attenuation down to -20 dB in transmission.