Cold-crystallisation of polyphenylene sulphide, studied by measuring the electrical resistance of a carbon-fibre polyphenylene-sulphide-matrix composite

Cold-crystallisation of polyphenylene sulphide (PPS) was studied by measuri ng the electrical resistance of a continuous-carbon-fibre PPS-matrix compos ite in the fibre direction during heating after cold-crystallisation. Melti ng of PPS caused a peak in the plot of resistance vs, temperature. Cold-cry stallisation was found to cause an extra peak at a lower temperature in thi s plot, due to the melting of the portion of PPS that had undergone cold-cr ystallisation. The resistance results are supported by calorimetry.