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- W177016858 abstract "Nanocomposites are interesting materials that present a peculiarity: they can show unexpected hybrid properties synergistically derived from two components. 1 To obtain a good nanocomposite, the clays layer should be exfoliated and dispersed. In this work we have chosen to prepare a nanocomposite using polypropylene, which is a commodity polymer with good properties, and Brazilian clay. Two types of hybrid nanocomposites were prepared in two different ways: one used a rheometer mix and the other used an extruder; the polypropylene/clay proportion was 95/5 w/w. The mixtures temperature was kept at 180 °C for 10 minutes. This work aimed to evaluate the characteristics of both types of obtained nanocomposites using solid state nuclear magnetic resonance (NMR). From 13 C CPMAS analyses no significant difference between the chemical shifts values of all 13 C derived from polypropylene in the nanocomposite was found, as compared to polypropylene. Therefore, not only changes in chemical shifts can be an indication of changes in morphology, especially when the polymeric matrix is formed. Indeed, changes in lineshape and intensity proportions also translate changes in sample morphology. Comparing the 13 C CPMAS NMR spectra of polypropylene with their nanocomposites prepared in the Haake and extruder we found that changes in the chains packing and ordination occurred, which pointed to the formation of a nanocomposite. To confirm these results, X-ray diffractograms were recorded. When the sample was prepared in the Haake only a composite was detected, but when the blend was performed in the extruder an exfoliated and dispensed nanocomposite was obtained." @default.
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- W177016858 date "2004-01-01" @default.
- W177016858 modified "2023-09-30" @default.
- W177016858 title "NMR Evaluation of Composites and Nanocomposites Obtained by Employing Polypropylene and Clay" @default.
- W177016858 hasPublicationYear "2004" @default.
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