Dielectric and thermoanalytical behavior of poly(p-phenylene sulfide) polymers

Poly(p-phenylene sulfide) polymers, both highly linear and crosslinked, were investigated to determine how their structural differences affect their dielectric and thermoanalytical behavior over a temperature range from room temperature to 300 degrees C. The T/sub g/ of the crosslinked type was 3 degrees C higher than that of the linear type according to the differential scanning calorimetry (DSC) measurement, suggesting a slight lag in micro-Brownian motion in the amorphous phase. Permittivity and dielectric dissipation factors as well as global thermally stimulated current (TSC) spectra were similar below T/sub g/. The linear type showed larger permittivity and dielectric dissipation factor values above T/sub g/, due to interfacial polarization. The linear type showed a strong rho peak at approximately 160 degrees C in the global TSC spectra, suggesting the release of injected space charges trapped at the crystal/amorphous interfaces, while the crosslinked type showed a weak rho peak at approximately 190 degrees C in the spectra, suggesting a decrease of the interface effect due to crosslinking.>