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Preparation and Characterization of PVDF/PVAc/CNT Nanocomposites

Davand, Razieh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44918 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Frounchi, Masoud
  7. Abstract:
  8. Many efforts have been performed on the poly(vinylidene fluoride), PVDF, due to its piezoelectric, pyroelectric and ferroelectric potentials. In this thesis Poly (vinyldene Flouride) (PVDF)/Poly (vinyl Asetate) (PVAc)/Multi-walled carbon nanotubes (MWCNT) and Poly (vinyldene Flouride) (PVDF)/Poly (vinyl Asetate) (PVAc)/Graphene Oxide nonasheets (GOn) nanocomposite films were prepared via solution casting method. The effect of concentration of PVAc, MWCNT and graphene oxide on PVDF nanocomposites were investigated. Graphene oxides synthesized by modified Hummer’s method. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) results showed that the crystalline structure of PVDF was changed from α-phase to β-phase by the addition of MWNTs and GOn and also indicated the decrease in crystallinity with increased PVAc content. We proved, via XRD and DSC as well as scanning electron microscopy (SEM) that PVAc content of nanocomposites enhanced dispersibility of MWCNT and GOn which significantly favors the formation of the β-crystalline phase of PVDF. With differential scanning calorimeter (DSC) and stress strain test, thermal and mechanical properties of the composite films were examined. As the DSC results showed, addition of MWNTs and GOn would lead to the increased melting temperature (Tg) and degree of crystalinity, implying that MWNTs nanoparticles and GOn could act as nucleating agent and confirmed the phase transformation from α-phase to β-phase as the β-crystals have higher T¬m. On the other hand, DSC results showed decrease in melting temperature (Tg) and degree of crystalinity with incorporation of PVAc, which was further proved with XRD results. Electrical conductivity of nanocomposite films was measured and it was found that the electrical conductivity increases with increasing MWCNT, PVAc and graphene oxide
  9. Keywords:
  10. Nanocomposite ; Polyvinylidene Fluoride (PVDF) ; Polyvinylacetate ; Carbon Nanotubes ; Graphene Oxide

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