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The primary aim of this paper is to provide an insight on the effect of the distribution of calcium carbonate nanoparticles (nano-CaCO 3 ) on the isothermal crystallization kinetics in Polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM)/nano-CaCO 3  composites prepared by different compounding procedures. PP/EPDM/CaCO 3  composites were prepared by two compounding procedures (direct compounding: mixed all three solid materials together; multistep compounding: the melted EPDM/CaCO 3  master batch in a single screw extruder blended with melted PP in twin-screw extruder via injecting into the twin-screw extruder from a lateral port at the melting section of the twin-screw extruder). Morphological observation showed that abundant CaCO 3  particles concentrated around EPDM dispersed phase in the multistep compounding composite, essentially different from the respectively dispersed morphology of CaCO 3  particles and EPDM domains in the matrix for the direct compounding composite. Moreover, better dispersion of CaCO 3  particles in the multistep compounding composite was observed comparing to the direct compounding composite. Futhermore, a pronounced improvement of the crystallization half time (t 1/2 ), rate of crystallization (G) was achieved in the multistep compounding composite, which may originate from the better dispersion of CaCO 3  particles providing larger nucleation density and the collaborative nucleation of EPDM and CaCO 3  during the isothermal crystallization.

Crystallization Kinetics for PP/EPDM/Nano-CaCO 3 Composites – The Influence of Nanoparticles Distribution