Influence of calcium carbonate nanoparticles on the crystallization of olypropylene

Materials Research

Daniel Eiras²  Luiz Antonio Pessan¹ 

[1] ,Universidade Federal de São Carlos Departamento de Engenharia de Materiais Programa de Pós-Graduação em Ciência e Engenharia de Materiais

关键词: polypropylene;    nanocomposites;    calcium carbonate;    crystallization;   

DOI  :  10.1590/S1516-14392009000400024

来源: SciELO

【 摘 要 】

The aim of this work was to study the influence of calcium carbonate nanoparticles in crystallization process of polypropylene. Four compositions of PP/CaCO3 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).

【 授权许可】

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