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- W2506808785 abstract "Asymmetric 6FDA-APPS polyimide membranes were made by a dry/wet phase inversion technique. The membranes had high gas selectivity without any additional coating of the skin layer. The apparent skin layer thickness depended strongly on evaporation time, which was of great importance for the formation of an asymmetric membrane with high gas permeance. The surface roughness of the membranes, analyzed from atomic force microscopy (AFM) micrographs, increased with decreasing the apparent skin layer thickness. The permeances of the asymmetric membranes for CO2, O2, N2, and CH4 were measured at 35°C and 76 cmHg. The asymmetric membranes exhibited gas selectivities equal to or even higher than those determined for dense, isotropic 6FDA-APPS membranes." @default.
- W2506808785 created "2016-08-23" @default.
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- W2506808785 date "1999-07-23" @default.
- W2506808785 modified "2023-10-10" @default.
- W2506808785 title "Influence of Surface Skin Layer of Asymmetric Polyimide Membrane on Gas Permselectivity" @default.
- W2506808785 doi "https://doi.org/10.1021/bk-2000-0744.ch005" @default.
- W2506808785 hasPublicationYear "1999" @default.
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