抄録
Polypyrrole-PMMA composites have been prepared by the hot press of the mixture of non coated and coated PMMA spheres (1-2μm, 30μm, 50μm in diameter) with polypyrrole by chemical polymerization utilizing FeCl3. Higher electrical conductivity has been obtained in the compounds prepared by polypyrrole coated PMMA spheres of smaller diameter. Conductivity is enhanced by more than 17 orders of magnitude and its activation energy decreases in step wise when the concentration of polypyrrole coated PMMA sphere exceeds 10%. At this concentration electrodes are considered to be bridged by conducting path (polypyrrole). That is, this insulator-metal transition can be explained by a percolation model.
The application of this new technique for the use in semiconducting layer of cables is proposed.
