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Preparation and Investigation of Behavior of Silica Nano Composites with TPU/PP

Meshkati, Erfan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40531 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmand
  7. Abstract:
  8. Blending can be used as one of the ways of producing materials with appropriate properties, which have many relative advantages in comparison with other methods like polymerization. Among the existing blends in the market and scientific areas, blends of polyurethane thermoplastic and polypropylene have been also studied because of its commercial importance and scientific interest. This blending can improve the mechanical properties, friction resistance, improvement of impact strength at low temperatures and improvement of plasticity properties. In this research, blends with different ratios of TPU/PP is produced by melt mixing, and for improving properties of blends, two kinds of nano fumed silica with R805 and R816 grades is used. Fractured sections of nanocomposites are studied by SEM. For chemical studying of nanocomposites, they are transmitted, and also properties like mechanical and rheological properties were studied. The results of different experiments show a blend of TPU/PP at low concentration of polypropylene are compatible at all temperatures but at higher concentrations like 50%, system isn’t still compatible at low temperatures and at high temperatures it approaches to a single phase. In general we can say at blends which the polyurethane is dominated, fumed silica R805 improves the properties in comparison with R816, because the tendency of hydrophilic of R805 is less than R816, and that’s caused by attached functional group to silicon atom, while fumed silica R816 improves the properties more for blends that the dominate phase is polypropylene.
  9. Keywords:
  10. Nanocomposite ; Compounding (Chemical) ; Polypropylene ; Thermoplastic Polyurethane ; Nanofumed Silica

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