TRANSPORTS IN BLENDS OF CONDUCTING POLYMERS

We investigated the transport properties of solution-processed conduct ive polymer blends of polyaniline-(camhpor sulfonic acid), PANI-CSA, w ith insulating polymethylmethacrylate (PMMA), as a function of various volume fraction (f) of PANI-CSA. Due to the phase separated morpholog y and the fibrillar geometry of percolating objects, a self-assembled PANI-CSA network in insulating matrix shows extremely low percolation threshold (f(c) approximate to 0.003), The characteristic metallic pro perties of pure PAM-CSA, such as positive temperature coefficient of r esistivity at high temperature, linear temperature dependence of therm oelectric power, and frequency independent ac conductivity, are retain ed in PANI-CSA/PMMA blends down to f(c). At low temperature, the hoppi ng transports through the conducting polymer network depends on the vo lume fraction of PANI-CSA in blends and its network structure.