CHEMICAL SYNTHESIS AND MICROWAVE PROPERTIES OF POLYPYRROLE DISPERSED IN A POLYCARBONATE MATRIX

Conductive composites have been obtained by polymerizing pyrrole with FeCl3 in presence of polycarbonate dissolved in CHCl3 and then precipi tating in a non solvent for both polymers. The conductivity of the com posite strongly depends on the synthesis conditions : stirring speed, initial pyrrole/matrix ratio, polycarbonate concentration. For composi tes containing less than 15% of pyrrole, it ranges from 10(-2) to 2 S/ cm. Also Microwave properties am strongly dependent on the processing (method, temperature). A pressed polypyrrole/polycarbonate composite g ives rise to microscopic conduction phenomenon, and its conductivity i s stable up to 200-degrees-C.