Positron lifetime as a probe for the investigation of conducting polystyrene

Positron annihilation lifetime spectroscopy is applied to study the microstructure and conducting mechanism of polystyrene conducting polymer. The positron lifetime spectra and electrical conductivity of the sample were measured as a function of temperature (30-145 deg C). The data clearly revealed the phase transition at about 62 deg C and the glass transition temperature (T sub g ) around 95 deg C. The dependence of the size and relative fractional of the ortho-positronium hole volume on the electrical conductivity has been obtained.