Melt crystallization and morphology of poly(p-phenylene sulfide) under high pressure

Abstract

The high-pressure melt-crystallization behaviours of poly(p-phenylene sulfide) (PPS) were investigated using WAXD, DSC, TEM and SEM. PPS extended-chain crystals with c-axis thickness exceeding 4.5 mu m were formed at high pressure. The DSC results showed that the melting temperature and melting enthalpy of high-pressure crystallized PPS samples were up to 327.53 degrees C and 94.96 J center dot g(-1), respectively, which which were higher than the values of ideal PPS perfect crystals used by some researchers, and the melting enthalpy of the samples fluctuated regularly during the thickness growth of the PPS crystals. Other characteristic morphologies obtained at high pressure, i.e. spherulites and rod-like crystals, were also presented with the SEM measurements.