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Improved gas selectivity of polyetherimide membrane by the incorporation of PIM polyimide phase
Author(s) -
García María G.,
Marchese José,
Ochoa Nelio A.
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44682
Subject(s) - polyetherimide , materials science , membrane , selectivity , fourier transform infrared spectroscopy , polyimide , miscibility , differential scanning calorimetry , analytical chemistry (journal) , gas separation , solubility , glass transition , chemical engineering , polymer chemistry , chemistry , polymer , chromatography , organic chemistry , composite material , biochemistry , catalysis , physics , layer (electronics) , engineering , thermodynamics
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 ( T gs ). The mobility selectivity ( D i/j ) dominated H 2 and O 2 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 H 2 /CO 2 (8.66) and O 2 /N 2 (10.90) gas separation factors. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44682.