Abstract
Three vinyl chloride polymers were annealed at temperatures in the range 40–160°C for times varying from 0.5 to 5 h. Structural changes occurring in the polymers were examined by density measurement, differential thermal analysis and X-ray diffraction. It was shown that the three polymers varied in their original crystallinity. Attempts to totally remove this crystallinity, were unsuccessful; further crystallinity could be introduced by annealing above T g Changes induced by annealing below T g were not due to crystallization. Methods used to measure crystallinity in poly(vinyl chloride) (PVC) were assessed.
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