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Title: Development of asymmetric 6FDA-2,6DAT hollow fiber membranes for CO2/CH4 separation: Part 2. Suppression of plasticization
Authors: Chung, T.-S. 
Ren, J.
Wang, R.
Li, D.
Liu, Y.
Pramoda, K.P.
Cao, C.
Loh, W.W.
Keywords: 6FDA-2,6 DAT polyimide
CO2-induced plasticization
CO2/CH4 separation
Heat treatment
Hollow fiber membrane
Suppression of plasticization
Issue Date: 15-Mar-2003
Citation: Chung, T.-S., Ren, J., Wang, R., Li, D., Liu, Y., Pramoda, K.P., Cao, C., Loh, W.W. (2003-03-15). Development of asymmetric 6FDA-2,6DAT hollow fiber membranes for CO2/CH4 separation: Part 2. Suppression of plasticization. Journal of Membrane Science 214 (1) : 57-69. ScholarBank@NUS Repository.
Abstract: We have studied the CO2-induced plasticization phenomenon of asymmetric poly(2,6-toluene-2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane diimide) (6FDA-2,6 DAT) hollow fiber membranes for CO2/CH4 applications. Several processing and thermal approaches have been investigated to study their effectiveness to enhance anti-plasticization characteristics. Experimental results indicate that hollow fiber membranes spun at different shear rates and take-up rates cannot effectively suppress the CO2 induced plasticization. Thermally treated 6FDA-2,6 DAT hollow fiber membranes show significant reduction in CO2-induced plasticization. Wide-angle XRD spectra reveal no visible change in d-space after thermal treatment, while solubility data imply no cross-links occurred. Scanning electron microscopy (SEM) pictures illustrate heat treatment results in more compact selective-skin layer and substructure, thus strengthening the anti-plasticization characteristics of hollow fibers. By considering the degree of plasticization, dense-layer thickness, and heat treatment temperature, an optimal temperature of 250°C (for 5min) is identified for the heat treatment of 6FDA-2,6 DAT hollow fiber membranes. NMR spectra suggest the cause of forming a highly densified skin after heat treatment is mainly due to chain relaxation and enhanced nodule interaction at elevated temperatures. © 2002 Elsevier Science B.V. All rights reserved.
Source Title: Journal of Membrane Science
ISSN: 03767388
DOI: 10.1016/S0376-7388(02)00535-5
Appears in Collections:Staff Publications

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