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Gas permselectivity properties of high free volume polymers modified by a low molecular weight additive
Author(s) -
RuizTreviño F. A.,
Paul D. R.
Publication year - 1998
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(19980418)68:3<403::aid-app8>3.0.co;2-n
Subject(s) - polysulfone , polymer , selectivity , bisphenol a , polymer chemistry , membrane , semipermeable membrane , permeability (electromagnetism) , chemical engineering , materials science , chemistry , bisphenol , organic chemistry , biochemistry , epoxy , engineering , catalysis
The permselectivity properties of mixtures of the highly substituted polymers tetramethylhexafluoro polysulfone (TMHFPSF) and tetramethylhexafluoro bisphenol A t ‐butyl isophthalate (TMHFBPA‐tBIA) with a low molecular weight glassy additive Kenflex A (denoted here as KXA) were measured for different gases and compared with the permselectivity properties shown by the base, unsubstituted polymers polysulfone (PSF) and bisphenol A t ‐butyl isophthalate (BPA‐tBIA). The results show that the selectivity‐permeability balance of polymer membranes may be appropriately tailored by a combination of chemical and physical alterations of the base polymer. The addition of modest amounts of KXA (ca. 20 wt %) into TMHFPSF or TMHFBPA‐tBIA leads to materials whose permeability/selectivity combination is better than that of the unsubstituted materials, PSF or BPA‐tBIA. The polymer TMHFPSF responds more beneficially to the incorporation of KXA than TMHFBPA‐tBIA. At the same level of permeability, mixtures based on TMHFPSF have higher selectivity factors for H 2 /CH 4 and CO 2 /CH 4 than those based on TMHFBPA‐tBIA. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 403–415, 1998