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Ag‐Functionalized Carbon Molecular‐Sieve Membranes Based on Polyelectrolyte/Polyimide Blend Precursors
Author(s) -
Barsema J. N.,
van der Vegt N. F. A.,
Koops G. H.,
Wessling M.
Publication year - 2005
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200305155
Subject(s) - barrer , materials science , membrane , polyimide , chemical engineering , selectivity , polymer chemistry , polyethylenimine , molecular sieve , polyelectrolyte , polymer , organic chemistry , permeability (electromagnetism) , nanotechnology , chemistry , composite material , catalysis , transfection , biochemistry , layer (electronics) , engineering , gene
We prepared dense flat‐sheet Ag‐functionalized carbon molecular‐sieve (CMS) membranes from blends of P84 co‐polyimide and a sulfonated poly(ether ether ketone) with a Ag + counterion (AgSPEEK). These blends offer the possibility of producing new functionalized precursor structures, which were previously not possible, such as integrally skinned asymmetric hollow fibers. Membranes prepared at a pyrolysis end temperature of 800 °C showed a maximum permeability for all tested gases at a Ag content of approximately 2.5 wt.‐% (He permeability P He = 465 Barrer (1 Barrer = 7.5 × 10 –18 m 2 s –1 Pa –1 ), P CO 2 = 366 Barrer, P O 2 = 91.8 Barrer, P N 2 = 10.3 Barrer). The maximum achieved selectivity for O 2 over N 2 with CMS membranes based on these blends was α O 2 /N 2 = 13.5 (Ag content: 4.5 wt.‐%, P O 2 = 52.7 Barrer). The CO 2 over N 2 selectivity reached a value of 48.9 (Ag content: 4.5 wt.‐%, P CO 2 = 191 Barrer). These observations are explained by the formation of selective bypasses around Ag nanoclusters in the CMS matrix.