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Preparation and Investigating of Polyolephine/graphene Oxide Nanocomposites Via In-situ Ziegler-natta Polymerization

Bahrami, Hiva | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46698 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ramazani Saadatabadi, Ahmad
  7. Abstract:
  8. The main object of this thesis is preparation and investigation of polyolophine/graphene oxide nanocomposites by using bi-supported Ziegler-Natta catalytic system and in-situ polymerization. Magnesium ethoxide and graphene oxide were used as supports of catalyst. TiCl4 was accompanied by triisobutyl aluminum (tibia) and diisobutyl phthalate (DIBP) as an electron donor constituting Ziegler-Natta catalytic system. Preparation of catalyst and polymerization were taken place in slurry phase under the argon atmosphere. At the beginning of the polymerization experiment, several type of nanocomposites were made under various conditions (such as different Al/Ti molar ratio) to find optimum condition to achieve maximum polymerization yield. Then, structural, thermal and mechanical properties of produced nanocomposites with different graphene oxide content were evaluated by XRD , SEM, DSC, TGA and tensile. Scanning Electron Microscopy (SEM) images shows good dispersion for graphene oxide throughout PE matrix. The mechanical properties of the nanocomposites were studied and the results showed that the Young (tensile) modulus and tensile strength of the prepared nanocomposites were significantly increased by increasing the filler content, which should be due to the high aspect ratio of GO plates and their uniform dispersion into UHMWPE matrix. The thermogravimetery (TGA) investigations reveal that the thermal stability of nanocomposites boost with increasing GO content and that initiation thermal decomposition temperature shifts to Higher values. Crystallization behavior was tested by using Differential Scanning Calorimetry (DSC). Results show that crystal content increases significantly with addition of graphene oxide
  9. Keywords:
  10. Graphene Oxide ; Ziegler-Natta Catalyst ; In-situ Polymerization ; Polyethylene Nanocomposite

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