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Study on Effect of Chemical Parameters on Mechanical and Morphological Properties of Biodegradable wo Phase Propylene/Starch Blends

Dorri Moghadam, Afsaneh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40567 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza
  7. Abstract:
  8. In recent years the rapid rise of polymer consumption especially in the form of packaging materials became a real menace for the environment. Polyolefin are some of the most dominant packaging materials and responsible by part of the problems in the disposal of one-trip packaging. One of the possible ways of solving this problem is the introduction of additives increasing their susceptibility to environmental degradation into non-biodegradable polymers. One such additive is starch- the natural, cheap, and easily biodegradable polymer. Starch was already used as a filler or as a blend with polyolefin. Addition of dry starch granules to polyolefin follows the general trend of filler effects on polymer properties. Addition of a plasticizer such as glycerol can further improve the ductility of starch, which is known as thermoplastic starch (TPS) and it is capable of flow easily. The mechanical and rheological behavior and susceptibility to natural degradation of starch containing polymer systems depends on many factors. In this study, blends of PP/TPS containing different glycerol, TPS and compatibilizers content were processed and their mechanical and morphological characterizations were assessed by tensile test and scanning electron microscopy, respectively. Also the mechanical and rheological properties of thermoplastic starch with different glycerol content were investigated. In order to estimate the characteristics of TPS, variety of methods, e.g. XRD, polarized light microscopy, bending test, DMTA, DSC, and internal mixer was used. Results indicate that an increase of starch content in composition results as a rule in worsening of mechanical and rheological properties of the system. On the other hand, only a high enough content of starch guarantees satisfactory degradability of the system. It follows from experiments that a continuous starch phase, improving the accessibility of the whole system to different degrading factors forms. The application of different modifying agents, i.e. compatibilizers leads in some cases to further remarkable property improvement
  9. Keywords:
  10. Polypropylene ; Morphology ; Mechanical Properties ; Biodegradable Blends ; Thermoplastic Starch

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