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Influence of novel surface modifying macromolecules and coagulation media on the gas permeation properties of different polymeric gas separation membranes

Savoji, H ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1002/app.35281
  3. Publisher: 2012
  4. Abstract:
  5. Integrally skinned asymmetric membranes for the separation of O 2 and N 2 were fabricated by the phase inversion technique from polysulfone, polyetherimide, and polyimide. Two types of surface modifying macromolecules (SMMs) including hydrophilic SMM (LSMM) and charged SMM (cSMM) were synthesized and blended with the casting solution to modify the membrane surface. The cast film was then immersed in the first coagulant alcohol (methanol, ethanol, or isopropanol) for a predetermined period, before being immersed in the second coagulant (water). The SMMs used in these experiments were laboratory synthesized by the two-step process of polyurethane prepolymer synthesis and end capping, before being characterized by differential scanning calorimetry. Their molecular structure was determined from the molecular weight obtained by gel permeation chromatography. The membranes were characterized by contact angle measurement and O 2 and N 2 gas permeation performance. Attempts were made to interpret the gas permeation data by delayed demixing affected by solubility parameters of polymer, solvent, and nonsolvent. Furthermore, the permeation performance of cSMM membranes was interpreted by the solvation of the charged sulfonate groups present in cSMM
  6. Keywords:
  7. gas separation membranes ; polyetherimide ; polyimide ; polysulfone ; surface modifying macromolecule ; wet-wet phase inversion method ; Asymmetric membranes ; Cast film ; Casting solutions ; De-mixing ; End capping ; Gas permeation ; Gas permeation properties ; Gas separation membrane ; Iso-propanols ; Membrane surface ; Non-solvents ; Novel surfaces ; Phase inversion techniques ; Phase-inversion method ; Polyurethane prepolymers ; Solubility parameters ; Sulfonate groups ; surface modifying macromolecules ; Two-step process ; Coagulation ; Contact angle ; Differential scanning calorimetry ; Ethanol ; Ethers ; Gases ; Gel permeation chromatography ; Macromolecules ; Methanol ; Permeation ; Polyetherimides ; Polyimides ; Polymers ; Polysulfones ; Separation ; Surface mount technology ; Gas permeable membranes
  8. Source: Journal of Applied Polymer Science ; Volume 124, Issue 3 , 2012 , Pages 2300-2310 ; 00218995 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.35281/abstract