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      Influence of calcium carbonate nanoparticles on the crystallization of olypropylene

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          Abstract

          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).

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          Most cited references20

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          Structural and mechanical properties of polymer nanocomposites

          S.C. Tjong (2006)
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            Study of Polystyrene and Acrylonitrile−Styrene Copolymer as Special β-Nucleating Agents To Induce the Crystallization of Isotactic Polypropylene

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              High Impact Toughness Polypropylene/CaCO3Nanocomposites and the Toughening Mechanism

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos )
                1980-5373
                2009
                : 12
                : 4
                : 523-527
                Affiliations
                [1 ] Universidade Federal de São Carlos Brazil
                [2 ] Universidade Federal de São Carlos Brazil
                Article
                S1516-14392009000400024
                10.1590/S1516-14392009000400024
                498ee9e3-ce56-4b3c-88e0-b914baa1fcae

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1439&lng=en
                Categories
                ENGINEERING, CHEMICAL
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

                General materials science,General engineering
                polypropylene,nanocomposites,calcium carbonate,crystallization

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