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Effect of reactive diluent on gas separation behavior of photocurable acrylated polyurethane composite membranes

Molavi, H ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1002/app.48293
  3. Publisher: John Wiley and Sons Inc , 2020
  4. Abstract:
  5. In this study, the effects of the type and content of reactive diluents on the permeation/separation of carbon dioxide/nitrogen (CO2/N2) through acrylate-terminated polyurethane (APU)-acrylate/acrylic diluent (APUA) composite membranes was investigated. A series of APUs based on poly(ethylene glycol) (PEG)-1000 g mol−1, toluene diisocyanate, and 2-hydroxyethyl methacrylate was synthesized and then diluted with several reactive diluents. The results obtained from differential scanning calorimetry (DSC) and Fourier transform infrared analyses showed that the microphase interference of hard and soft segments increased with increasing reactive diluent content. Furthermore, with increasing alkene double bond of reactive diluents, the degree of phase separation increased, which might be due to the higher gel content of APUAs. APUAs were used as top selective layer on PS/PSF as the support layer to obtain composite membrane. Field emission scanning electron microscopy micrographs revealed that APUAs penetrated into the support layer, leading to strong interfacial adhesion between APUA and support layers. The gas permeation experiments indicated that the gas permeability decreased, while the CO2/N2 selectivity increased with increasing reactive diluent content due to the enhancement of crosslinking density of APUAs. Moreover, the reactive diluent with high polarity, for example, acrylonitrile monomer, exhibited higher CO2/N2 selectivity due to the improvement in solubility of CO2 in APUA, while the permeability was retained compared with other reactive diluents. The thickness of APUA selective layer exhibited expectedly opposite effect on permeability and selectivity; however, the increment in selectivity is higher than the reduction in permeability when the thickness decreased from 50 to 10 μm. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48293. © 2019 Wiley Periodicals, Inc
  6. Keywords:
  7. Composite membrane ; Gas separation ; Poly(ethylene glycol) ; Reactive diluent ; UV-curable acrylated polyurethane ; Carbon dioxide ; Composite membranes ; Curing ; Differential scanning calorimetry ; Ethylene glycol ; Field emission microscopes ; Gas permeability ; Permeation ; Phase separation ; Polyethylene glycols ; Polyols ; Polyurethanes ; Scanning electron microscopy ; 2-hydroxyethyl methacrylate ; Field emission scanning electron microscopy ; Fourier transform infra reds ; Gas separation behavior ; Gas separations ; Polyurethane composites ; Reactive diluents ; UV curable ; Gas permeable membranes
  8. Source: Journal of Applied Polymer Science ; Volume 137, Issue 3 , 15 January , 2020
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/app.48293