Effect of Pressure on Electrical Conductivity of Doped Poly (p-Phenylene Sulfide)

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Abstract
The electrical conduction mechanism in poly(p-phenylene sulfide) (PPS) doped with iodine (I2) and tetracyanoethylene (TCNE) was investigated. X-ray diffraction and fluorescence X-ray experiments revealed that the doped TCNE and I2 exist mainly in an amorphous region and the desorption of doped I2 becomes very active with increasing temperature. The effect of pressure on the electrical conductivity was measured to determine the conduction mechanism in doped PPS, showing that electronic conduction takes place in TCNE-doped PPS, but ionic conduction in I2-doped PPS. In heat-treated I2-doped PPS, it was observed that electronic conduction also contributes to the conductivity at higher pressures. Furthermore, an additional increase in the conductivity was observed in TCNE and I2 double-doped PPS.