Thermal analysis and its application in evaluation of fluorinated polyimide membranes for gas separation

Wulin Qiu, Chien-Chiang Chen, Matthew R. Kincer, William J. Koros

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Seven polyimides based on (4,4′-hexafluoroisopropylidene) diphthalic anhydride, 6FDA, with different chemical structures were synthesized in a single pot two-step procedure by first producing a high molecular weight polyamic acid (PAA), followed by reaction with acetic anhydride to produce polyimide (PI). The resulting polymers were characterized using thermal analysis techniques including TGA, derivative weight analysis, TGA-MS, and DSC. The decarboxylation-induced thermal cross-linking, ester cross-linking through a diol, and ion-exchange reactions of selected polyimide membranes were investigated. Cross-linking of polymer membranes was confirmed by solubility tests and CO 2 permeability measurements. The thermal analysis provides simple and timesaving opportunities to characterize the polymer properties, the ability to optimize polymer cross-linking conditions, and to monitor polymer functionalization to develop high performance polymeric membranes for gas separations. © 2011 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)4073-4082
Number of pages10
JournalPolymer
Volume52
Issue number18
DOIs
StatePublished - Aug 2011
Externally publishedYes

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