Effect of the Amide Bond Diamine Structure on the CO 2 , H 2 S, and CH 4 Transport Properties of a Series of Novel 6FDA-Based Polyamide–Imides for Natural Gas Purification
Type
ArticleAuthors
Vaughn, J.Koros, W. J.
KAUST Grant Number
KUS-I1-011-21Date
2012-08-21Online Publication Date
2012-08-21Print Publication Date
2012-09-11Permanent link to this record
http://hdl.handle.net/10754/598063
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Show full item recordAbstract
A series of higher permeability polyamide-imides based on 2,2′-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride with comparable plasticization resistance to Torlon were synthesized and formed into dense film membranes. Polymers possessing 2,4-diamino mesitylene (DAM) were stable up to 56 atm of pure CO 2, which is due to enhanced charge transfer complex formation compared to polymers containing 4,4′- (hexafluoroisopropylidene) dianiline (6FpDA) and 2,3,5,6-tetramethyl-1,4- phenylenediamine (TmPDA). The new polymers containing DAM and TmPDA showed ideal CO 2/CH 4 selectivities of near 50 with CO 2 and H 2S permeabilities over an order of magnitude higher than Torlon. CO 2 and CH 4 sorption in the DAM- and TmPDA-based materials was reduced, whereas H 2S sorption was enhanced relative to membranes containing fluorinated 6FpDA. Consequently, DAM- and TmPDA-based membranes showed increased stability toward high pressure CO 2 but lower plasticization resistance toward pure H 2S. These results highlight the differences between CO 2 and H 2S that challenge the rational design of materials targeting simultaneous separation of both contaminants. © 2012 American Chemical Society.Citation
Vaughn J, Koros WJ (2012) Effect of the Amide Bond Diamine Structure on the CO 2 , H 2 S, and CH 4 Transport Properties of a Series of Novel 6FDA-Based Polyamide–Imides for Natural Gas Purification . Macromolecules 45: 7036–7049. Available: http://dx.doi.org/10.1021/ma301249x.Sponsors
This publication is based on work supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). The authors would also like to thank Dr. JR Johnson and Dr. Oguz Karvan (Ga. Tech.) for design and construction of the H<INF>2</INF>S systems as well as Megan Lydon (Ga. Tech.) for assistance in the XRD measurements.Publisher
American Chemical Society (ACS)Journal
Macromoleculesae974a485f413a2113503eed53cd6c53
10.1021/ma301249x