Influence of calcium carbonate nanoparticles on the crystallization of olypropylene

Abstract

The aim of this work was to study the influence of calcium carbonate nanoparticles in crystallization process of polypropylene. Four compositions of PP/CaCO 3 nanocomposites were prepared in a co-rotational twin screw extruder machine with calcium carbonate content of 3, 5, 7 and 10 wt. (%). The tests included SEM analyzes for calcium carbonate, differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD) for the nanocomposites. The results showed an increase in PP crystallization temperature and crystallinity degree, and a reduction in spherullites size. The formation of PP β phase was confirmed by DSC and WAXD results. Finally from DSC analyses under isothermal conditions it was confirmed that calcium carbonate nanoparticles have a nucleation effect in polypropylene crystallization process by reducing the half crystallization time and increasing the kinetic constant (k).

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“…The characteristic reflections at angles of 2 θ (14.1, 16.9, 18.5, 21.2 and 22.0), corresponding to the crystalline planes (1 1 0), (0 4 0), (1 1 1) and (1 3 0) respectively, were clearly visible. No additional reflections at 16.2 (3 0 0) and 19.8 (1 1 7) corresponding to β or γ iPP crystalline forms were observed [27] , [28] , [29] . Therefore, it can be stated, in accordance with previously presented DSC data, that addition of BMC and cBMC led only to insignificant changes of crystallization behaviour and did not influence polymorphism of isotactic polypropylene matrix.…”

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