This article describes how the Flash DSC was used to investigate the influence of calcium carbonate on the crystallization of filled polypropylene (PP) in the temperature range 120 °C to 0 °C. At low supercooling (above 80 °C), the presence of calcium carbonate reduces the crystallization rate of the -phase. Between 45 °C and 80 °C, the crystallization of the -phase is accelerated. The mesophase formation at low temperatures is not influenced by the filler.
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