Complex Conductivity of a Conducting Polymer Composite at Microwave Frequencies

摘要

A model is proposed for the complex conductivity of a conducting polymercomposite as a function of frequency based on an equivalent electrical network of series and parallel circuits containing resistors and capacitors The results are similar to the power laws derived from percolation theory. The effect of frequency and volume fraction of polypyrrole dispersant on the complex conductivity of a sample conducting polymer composite is analysed according to the model. The relationships between alpha, dispersant volume fraction and loss tangent of the composite permittivity can be predicted on a semi-quantitative basis. (MM).