Premium
Gas‐permeation properties of asymmetric polycarbonate, polyestercarbonate, and fluorinated polyimide membranes prepared by the generalized dry–wet phase inversion process
Author(s) -
Pinnau Ingo,
Koros William J.
Publication year - 1992
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.1992.070460709
Subject(s) - membrane , polyimide , polycarbonate , phase inversion , permeation , materials science , polymer , polymer chemistry , chemical engineering , evaporation , phase (matter) , composite material , chemistry , layer (electronics) , organic chemistry , thermodynamics , biochemistry , physics , engineering
Essentially defect‐free, ultrathin asymmetric polycarbonate, polyestercarbonate, and 6FDA–IPDA polyimide membranes were prepared by a dry/wet phase inversion process using forced‐convective evaporation. The pure gas permeation properties of these membranes were determined for N 2 , O 2 , He, CO 2 , and CH 4 . The average apparent skin‐layer thicknesses of the membrane samples varied between 330 and 580 Å, which is substantially thinner than for previous defect‐free membranes formed by the conventional wet phase inversion process. This study indicates that the dry/wet phase inversion process appears to be universally applicable to form ultrathin, defect‐free asymmetric membranes from hydrophobic, glassy polymers. © 1992 John Wiley & Sons, Inc.