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Gas permeability and selectivity through asymmetric polyimide membranes
Author(s) -
Kawakami Hiroyoshi,
Mikawa Masato,
Nagaoka Shoji
Publication year - 1996
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/(sici)1097-4628(19961114)62:7<965::aid-app2>3.0.co;2-q
Subject(s) - permeance , polyimide , selectivity , membrane , permeability (electromagnetism) , coating , materials science , chemical engineering , polymer chemistry , gas separation , semipermeable membrane , layer (electronics) , chemistry , composite material , organic chemistry , catalysis , engineering , biochemistry
Abstract Permeability and selectivity of CO 2 , O 2 , N 2 , and CH 4 were determined for the asymmetric membrane of aromatic polyimide derived from 2,2′‐bis(3,4‐dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and 3,3′‐diaminodiphenylsulfone (m‐DDS) at 35°C and at pressure up to 76 cmHg. The average apparent skin layer thickness of all asymmetric membranes measured was 2.6 μm. The selectivities for (O 2 /N 2 ) and (CO 2 /CH 4 ) in the membranes were 11.5 at O 2 permeance of 3.2 × 10 −7 and 153 at CO 2 of 6.3×10 −7 [cm 3 (STP)/cm 2 s cmHg], respectively, without the necessity of an additional coating process. The average gas selectivities of the asymmetric memberanes were much larger than those determined for the dense membrances. The effect of the microstructure of polyimide on the gas selectivity is discussed. © 1996 John Wiley & Sons, Inc.