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Tuning the gas transport performance of carbon molecular sieve membranes by the morphological changes of 6FDA/PMDA-TMMDA precursors

Shou, L. and Chung, T. S. and Wensley, G. (2004) Tuning the gas transport performance of carbon molecular sieve membranes by the morphological changes of 6FDA/PMDA-TMMDA precursors. In: Proceedings of Regional Symposium on Membrane Science and Technology 2004, 21-25 April 2004, Puteri Pan Pacific Hotel, Johor Bharu, Malaysia.

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Abstract

6FDA/PMDA-TMMDA [copoly(4,4’-methylenebis(2,6-dimethyl)-2,2-bis(3,4-dicarboxy- lphenyl) hexafluoro propane/pyromellitic) diimide], a new co-polyimide was synthesized and different solvents were utilized to alter the morphology of resultant membranes. Membranes were then pyrolyzed to produce Carbon Molecular Sieve membranes (CMSMs). The effects of the different morphologies of co-polyimide precursors and the pyrolysis temperatures (protocols) on the gas transport performance were studied. CMSMs were characterized with XRD, TGA-FTIR and gas permeation tests. It was found that higher pyrolysis temperature resulted in lower permeability and higher selectivity. Interestingly, CMSMs derived from precursors with different morphologies exhibited different permeabilities at the pyrolysis temperature of 550 °C. However, when the pyrolysis temperature was elevated to 800 °C, permeabilities become almost the same for all precursors. This result can be explained in terms of relationship between the stability of precursor and pyrolysis temperatures. Besides, although the gas transports performance of CMSMs changes with pyrolysis temperatures and morphologies, the overall performance of any CMSM in this study are superior to their respective polymeric (precursor) membranes. Based on the experimental results, a novel method is developed to tune the CMSMs’ gas transport performance by means of physical manipulation of precursor membrane’s morphology.

Item Type:Conference or Workshop Item (Paper)
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Natural Resources Engineering (Formerly known)
ID Code:1047
Deposited By: Pn Norazana Ibrahim
Deposited On:23 Feb 2007 09:01
Last Modified:01 Jun 2010 02:50

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