JORGE NASCIMENTO DE SALES
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Capítulo IPEN-doc 25627 Effect study of the incorporation of the Green Lake clay in the polypropylene homopolymer properties2019 - SALES, J.N.; POVEDA, P.N.S.; ORTIZ, A.; VALENZUELA-DIAZ, F.R.; SILVA, L.A.The advancement of technology has demanded the development of materials with increasingly lighter and more resistant properties. The development of nanocomposites first started in the mid-80s and contributed for obtaining materials with excellent properties. In this work, Green Lake clay was organophilized and incorporated into a commercial homopolymer polypropylene. The efficiency of organophilization was confirmed by water swelling analysis and, later, by Xray diffraction (XRD) analysis. Composites at 0.5, 1.0 and 2% by weight of clay/polypropylene were prepared by double screw extrusion. The properties of the composite were evaluated by means of Charpy impact resistance, tensile strength at rupture, thermogravimetric analysis (TGA). Crystallinity index was determined by differential scanning calorimetry (DSC). The organophilization processwas efficient, the thermogravimetric analysis showed that there was no decrease in the thermal stability of the composites when compared to pure polypropylene, and the results of the Charpy impact resistance were equivalent when compared to the commercial nucleant composites.Resumo IPEN-doc 25489 Effect of the incorporation of green lake clay in the property of impact and crystallinity of polypropylene2018 - SALES, J.N.; POVEDA, P.N.S.; GARCIA, R.H.L.; VALENZUELA-DIAZ, F.R.; SILVA, L.A.Clays are extremely versatile materials, being present in many industrial activities. For applications in plastic materials it is necessary to pre-treat the clays by means of an organophilization process. In this work, Green Lake clay was treated with three different ammonium quaternary salts. The choice of the quaternary salt used in the later steps was performed based on the water swelling test results. The efficiency of organophilization of Verde Lago clay was verified by X-ray diffraction technique (XRD), verifying the basal distance between lamellae of the structure. Polypropylene composites were prepared with additions of 0.5% 1.0% and 2.0% by weight of the Verde Lago clay, which were characterized by means of the thermogravimetric test (TGA), to verify the actual clay content in each composite; differential scanning calorimetry (DSC) for analysis of degree of crystallinity and resistance to Charpy impact