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- Title
Improved gas selectivity of polyetherimide membrane by the incorporation of PIM polyimide phase.
- Authors
García, María G.; Marchese, José; Ochoa, Nelio A.
- Abstract
ABSTRACT The aim of this work was to prepare blend membranes of a polyetherimide (PEI) and different ratios of a microporous polyimide (PIM-B) in order to obtain an improved material for gas selectivity. Miscibility of the membranes was studied through fourier transform infrared spectroscopy (FTIR), Fluorescence, ultraviolet-visible spectroscopy (UV-vis), polarize light microscope images, X-ray diffraction (XRD), and differential scanning calorimetry analysis. Gas permeability assays were also performed. Results showed blends were partially miscible along the different ratios due to the existence of: (i) absorption shoulders at lower wavenumbers on the carbonyl stretching band; (ii) red-shifting of Fluorescence and UV-vis absorption bands; (iii) decreasing of d-spacing as the amount of PIM-B phase increased; and (iv) composition-dependent glass transition temperatures ( Tgs). The mobility selectivity ( Di/j) dominated H2 and O2 gas separations. High solubility coefficients ( S) linked to PIM-B microporosity improved the ideal gas selectivity of the blend membranes. PEI/PIM-B membrane at the ratio of 80/20 showed impressive H2/CO2 (8.66) and O2/N2 (10.90) gas separation factors. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44682.
- Subjects
POLYIMIDES; POLYMER blends; MISCIBILITY; FOURIER transform infrared spectroscopy; DIFFERENTIAL scanning calorimetry
- Publication
Journal of Applied Polymer Science, 2017, Vol 134, Issue 14, pn/a
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.44682