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°C. The T_g of the crosslinked type was 3°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_g. The linear type showed larger permittivity and dielectric dissipation factor values above T _g, due to interfacial polarization. The linear type showed a strong ρ peak at ~160°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 ρ peak at ~190°C in the spectra, suggesting a decrease of the interface effect due to crosslinking