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prediction of Polymeric Membrane Morphology Based on Phase Diagrams for MBR Applications

Mohsenpour, Sajjad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47711 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Sayf Kordi, Ali Akbar; Hemmati, Mahmoud; Rekabdar, Fatemeh
  7. Abstract:
  8. In this research, we have tried to predict the morphology of the membranes that were prepared by phase inversion method. In this research Polyvinylinedifluoride (PVDF) and dimethylacetamide (DMAc) was used as the polymer and solvent. The affect of titanium oxide (TiO2 ) and polyvinylpyrolidene (PVP) which are respectively an inorganic and an organic additive, on the morphology of the membranes was investigated. Ternary and Quadratic phase diagrams were drawn based on the Flory Huggins theory. The interaction between components was determined and the effect of interactions and molar volumes of polymer, solvent, non-solvent and additives on the binodal line was investigated. To predict membrane morphology, thermodynamic and kinetic parameter were determined and it was found that more kinetic parameter induce denser membrane and it is so-called sponge like morphology. By increasing the thermodynamic parameter, membranes become more porous and it is so-called finger like morphology. The membranes were characterized by measuring permeability, porosity and contact angel. Results show that by adding TiO2 permeability and porosity increase initially but by increasing concentration both of them decrease. By increasing the concentration of PVP up to 5%, permeability and porosity increaseses and then decreases. By increasing the concentration of both additives thermodynamic and kinetic parameters increase
  9. Keywords:
  10. Thermodynamic Parameters ; Kinetic Parameters ; Phase Diagram ; Membrane Morphology ; Immersion Percipitation

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