Effect of Carbon Fillers in Ultrahigh Molecular Weight Polyethylene Matrix Prepared by Twin-Screw ExtrusionReport as inadecuate




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Oxidized GO and expanded G-Exp graphite were employed to prepare composites with ultrahigh molecular weight polyethylene UHMWPE matrix using masterbatches of polyethylene with different compositions. The materials and a blend of UHMWPE-HDPE were prepared by extrusion and their properties were evaluated. The effect of carbon fillers on the crystalline structure, thermo dynamic-mechanical DMTA and thermal properties melting and crystallization temperatures of the composites were discussed. The thermogravimetric analysis TGA, differential scanning calorimetry DSC and wide-angle X-ray diffraction WAXD measurements showed that the addition of masterbatch with GO and G-Exp significantly increased the crystallite size of composites, increasing the temperatures of melting, degradation, glass transition and the degree of crystallinity of polyethylene. DMTA analysis indicated the storage and loss moduli of composites in relation to neat UHMWPE, the blend and UHMWPE-composites. SEM micrographs showed a flatter, continuous and uniform surface meaning a compact lamellar structure. The present work resulted in interesting findings on the effects of GO on the crystalline structures, mechanical and thermal properties of UHMWPE, which can lead to generalizations useful for future work.

KEYWORDS

Polyolefin, Blend, Oxidized Graphite, Expanded Graphite, Polyethylene Composites

Cite this paper

Rocha, L. , Cordeiro, S. , Ferreira, L. , Ramos, F. and de Fátima Marques, M. 2016 Effect of Carbon Fillers in Ultrahigh Molecular Weight Polyethylene Matrix Prepared by Twin-Screw Extrusion. Materials Sciences and Applications, 7, 863-880. doi: 10.4236-msa.2016.712066.





Author: Luiz Felipe M. Rocha1, Suellem B. Cordeiro1, Leonardo C. Ferreira1, Flávio James H. Ramos2, Maria de Fátima Marques1*

Source: http://www.scirp.org/



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