Premium
Incorporation effects of fluorinated side groups into polyimide membranes on their physical and gas permeation properties
Author(s) -
Kim JeongHoon,
Lee SooBok,
Kim Sang Youl
Publication year - 2000
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 - 10.1002/1097-4628(20000919)77:12<2756::aid-app240>3.0.co;2-c
Subject(s) - polyimide , permeation , membrane , polymer chemistry , solubility , side chain , monomer , condensation polymer , pendant group , chemistry , alkyl , materials science , organic chemistry , polymer , layer (electronics) , biochemistry
The effects of incorporation of fluorinated alkyl side groups into polyimide membranes were investigated in terms of their physical and gas permeation properties. Four polyimides with fluorinated side groups and four polyimides without the side groups were prepared by polycondensation of 2‐(perfluorohexyl)ethyl‐3, 5‐diamino benzoate (PFDAB) and m ‐PDA with four aromatic dianhydrides (6FDA, ODPA, BTDA, and PMDA), respectively. It was found that the incorporation of fluorinated side groups into the polyimide membranes decreased their surface free energies (T g s), solubility parameters, and fractional free volume (FFV)s and therefore, enhanced the permeabilities for CO 2 , O 2 , N 2 , and CH 4 gases but reduced the selectivities for CO 2 / CH 4 , O 2 /N 2 , CO 2 /N 2 gas pairs depending upon the structure of dianhydride monomers. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2756–2767, 2000