ABSTRACT:A light scattering apparatus convenient for use at high temperatures was constructed. Intensities of scattered light are measured with a photon counter. Weight-average molecular weights of linear poly(phenylene sulphide)s and then their intrinsic viscosity-molecular weight relationship were determined in 1-chloronaphthalene at 220°C. Moreover, it is shown that a heat-treated poly(phenylene sulphide) has a lower intrinsic viscosity than the linear one with the same molecular weight, probably because of its branching or cross-linking structure.
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