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The study of Structure and Mechanical Properties of Thermopelastic Starch/Polyethylene alloy Nanocomposite Reinforced by Nanoclay

Amiri, Mohammad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47005 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza; Faghihi Sani, Mohammad Ali
  7. Abstract:
  8. Recently, due to the increase of environmental concerns, a significant raise in applying films and packaging containers, pollution produced from petroleum-based plastics packaging and problems arising from the various methods of waste disposal, the researchers have concentrate to replace these materials with biodegradable ones. In this study, a nanocomposite based on alloy matrix of thermoplastic starch and polyethylene which is reinforced with different amounts of Montmorillonitenanoclay has been constructed by the extrusion process. Furthermore, in order to increase the compatibility between the polar and non-polar components in the group of samples, compatibilizer was used and its effectiveness was evaluated. Mechanical results illustrated that by the addition of compatibilizer to the alloy, mechanical properties often improves and strength and modulus of nanocomposite containing 5 phrnanoclay to the highest level , ie, 8.09 MPa and arrive 150 MPa, respectively. Studies of fracture surfaces displayed that the addition of compatibilizer, morphology would be finer and more uniform which is the result of enhanced adhesion phases before the compatibilizer. Nanoclay distribution of the alloy and the separation plates of nanoclay was investigated by X-ray diffraction and the dispersion of the Exfoliation in 1 phrnanoclay was observed. Wettability test results indicate that the thermoplastic starch has strong hydrophilic properties as of the result of alloy with polyethylene the degree of its hydrophilicity would be reduced. Finally, in comparison with related researches, a distinctive method was used to measure biodegradation of samples. In biodegradation test, the respiration rate of biological samples was obtained through measuring the Carbon dioxide emitted by micro- organism. The findings indicated that in comparison with polyethylene, the rate of biodegradation in nanocomposite samples has increased 8 to 19.5–fold over a month
  9. Keywords:
  10. Nanocomposite ; Thermoplastic Starch ; Polyethylene ; Mechanical Properties ; Packaging ; Biodegradability ; Nanoclay

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