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Preparation of macroporous carbons from phase‐inversion membranes
Author(s) -
Hatori H.,
Yamada Y.,
Shiraishi M.
Publication year - 1995
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.1995.070570711
Subject(s) - membrane , materials science , carbonization , phase inversion , chemical engineering , polyimide , porosity , polymer , porosimetry , mesoporous material , carbon fibers , synthetic membrane , polymer chemistry , scanning electron microscope , composite material , organic chemistry , porous medium , composite number , chemistry , layer (electronics) , biochemistry , engineering , catalysis
Preparation of porous carbons from phase‐inversion membranes was investigated as a control method of pore structure in carbon materials. The structure in carbon films was estimated by means of electron microscopy, mercury porosimetry, and gas‐adsorption methods. When phase‐inversion membranes of Kapton‐type polyimide were carbonized, they maintained the film form and gave macroporous carbon films having high porosity. However, micro‐ and mesopore structures in the carbon films were not influenced by phase inversion in the polymer stage, and, thus, the macroporous carbons had a molecular sieve property similar to that of carbons prepared from nonporous polyimide films. A macroporous structure in cellulose membranes was similarly maintained through the carbonization step, but some of these were fractured or deformed owing to the large shrinkage. Polymer membranes have a capability as porous carbon precursors if they satisfy two requirements: solid‐state carbonization and relatively high carbon yield. A composite membrane of a macroporous carbon with a dense carbon having an impervious ability was readily produced by shaping at the precursor stage. © 1995 John Wiley & Sons, Inc.