Certificates

We are aware of an issue with certificate availability and are working diligently with the vendor to resolve. The vendor has indicated that, while users are unable to directly access their certificates, results are still being stored. Certificates will be available once the issue is resolved. Thank you for your patience.

(376g) Effects of Regiochemistry on the Properties and Gas Separation Performances of Ionic Polyimides

Authors: 
Dennis, G. P., University of Alabama
O'Harra, K. E., University of Alabama
Bara, J. E., University of Alabama
A bis(imidazole) monomer synthesized from 6-FDA and 1-(3-aminopropyl) imidazole can be used to form "ionic polyimides" through condensation polymerizations with benzylic dihalides such as dichloroxylenes, and subsequent ion-exchange with lithium bistriflimide (LiTf2N). Our synthetic techniques have yielded ionenes with MN values typically > 75,000 and as high as 100,000 amu. Ionic polyimides can also absorb and incorporates ionic liquids (ILs) within their structures which can have distinct effects on ordering the ionic polyimide. This work explores how the regiochemistry of the xylene linkage (i.e., para, meta, ortho) affects polymer properties and their performances as gas separation membranes for the separation of CO2 from species such as H2, CH4 and N2.