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Preparation of water‐swollen hydrogel membranes for gas separation
Author(s) -
Park YouIn,
Lee KewHo
Publication year - 2001
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.1274
Subject(s) - membrane , permeation , vinyl alcohol , glutaraldehyde , swelling , chemical engineering , polymer chemistry , materials science , gas separation , differential scanning calorimetry , semipermeable membrane , chemistry , chromatography , polymer , composite material , biochemistry , engineering , thermodynamics , physics
Water‐swollen hydrogel (WSH) membranes for gas separation were prepared by the dip‐coating of asymmetric porous polyetherimide (PEI) membrane supports with poly(vinyl alcohol) (PVA)–glutaraldehyde (GA), followed by the crosslinking of the active layer by a solution method. Crosslinked PVA/GA film of different blend compositions (PVA/GA = 1/0.04, 0.06, 0.08, 0.10, 0.12 mol %) were characterized by differential scanning calorimetry (DSC) and their water‐swelling ratio. The swelling behavior of PVA/GA films of different blend compositions was dependent on the crosslinking density and chemical functional groups created by the reaction between PVA and GA, such as the acetal group, ether linkage, and unreacted pendent aldehydes in PVA. The permeation performances of the membranes swollen by the water vapor contained in a feed gas were investigated. The behavior of gas permeation through a WSH membrane was parallel to the swelling behavior of the PVA/GA film in water. The permeation rate of carbon dioxide through the WSH membranes was 10 5 (cm 3 cm −2 s −1 cmHg) and a CO 2 /N 2 separation factor was about 80 at room temperature. The effect of the additive (potassium bicarbonate, KHCO 3 ) and catalyst (sodium arsenite, NaASO 2 ) on the permeation of gases through these WSH membranes was also studied. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1785–1791, 2001