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Gas permeation properties of new type asymmetric membranes
Author(s) -
Hachisuka Hisao,
Ohara Tomomi,
Ikeda Kenichi
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(19960829)61:9<1615::aid-app21>3.0.co;2-n
Subject(s) - polyimide , membrane , permeation , materials science , propane , silicone , coating , layer (electronics) , polymer chemistry , porosity , chemical engineering , composite material , chemistry , organic chemistry , engineering , biochemistry
We have developed a new type of asymmetric membranes having a homogeneous hyperthin skin layer, which was used as a polyimide synthesized by 2,2‐bis(3,4‐dicarboxyphenyl) hexafluoropropane dianhydride (6FDA) and 2,2‐bis(4‐amino phenyl) hexafluoro‐propane (BAAF). The skin layer thicknesses of the 6FDA‐BAAF polyimide asymmetric membranes were 40–60 nm, and the porosity was 10 ‐6 % when a defect size was assumed as 5 nm. The permselectivity of 6FDA‐BAAF polyimide asymmetric membranes after silicone coating had α of 40 for CO 2 /CH 4 and a flux of 1.0 [Nm 3 /m 2 ‐h‐atm] (=3.7 × 10 −4 [cm 3 (STP)/cm 2 s cmHg]) for CO 2 , α of 4.3 for O 2 /N 2 and a flux of 2.0 × 10 −1 [Nm 3 /m 2 /h/atm] (=7.1 × 10 −5 [cm 3 (STP)/cm 2 s cmHg]) for O 2 . These values were constant for large‐scale manufacturing. © 1996 John Wiley & Sons, Inc.