Perfluorinated anion exchange membrane

The interest in perfluorinated ion-exchange membranes has increased extensively in recent years because of their industrial importance. A growing body of research concerning their structure and properties has developed. Much of this work has been summarized in a recent monograph. " While perfluorinated anion-exchange membranes have not yet been produced, several perfluorinated cation-exchange types have been synthesized and fabricated into membrane form, as listed in Table 1. 

It is impossible to prepare perfluorinated anion exchange membranes due to the strong electron-donor properties of the fluorine atom. For example, a stable... 

Jung MJ, Arges CG, Ramani V (2011) A perfluorinated anion exchange membrane with a 1,4-dimethylpiperazinium cation. J Mater Chem 21 6158-6160. doi 10.1039/cljml0320b... 

In addition to the various perfluorinated cation-exchange membranes an anion-exchange membrane has also been developed. The anion-exchange membrane has similar chemical and thermal properties to the perfluorinated cation-exchange membrane. 

I, 1980, 76, 2558-2574 L.Y. Levy, A. Jenard and H.D. Hurwitz, Hydration and ion-exchange process in carboxylic membranes. Part 1. Infrared spectroscopic investigation of the acid membranes, J. Chem. Soc. Trans. 1, 1982, 78, 29-36 M. Falk, Infrared spectra of perfluorosulfonated polymer and water in perfluorosulfonate polymer, Perfluorinated Ionomer Membranes, ed. A. Eisenberg, H.L. Yeager, ACS Symposium Series, American Chemical Society, Washington DC, 1982, p. 139 C. Heitner-Wirguin and D. Hall, An infrared study of an anion exchange membrane,... 

DLFCs can use a cation exchange membrane (CEM) or an anion exchange membrane as an electrolyte, the principles of which are shown in Fig. 6.1a and b. DLFCs that use acidic and alkaline reaction media correspond to the CEM and AEM types, respectively. Perfluorinated sulfonic acid membranes, that is, Nafion , are typical CEMs, in which a countercation of sulfonate can be exchanged for another... 

Ion-exchange membrane is designed to allow the transport of primarily sodium ions and water from the anolyte to the catholyte compartment, whereas the diaphragm allows the percolation of all the anolyte through the separator. The cation-conducting, ion-exchange membrane is structured to reject anions, as indicated in Fig. 26.9. The chlor-alkali membranes in use today consist of one or more perfluorinated ion-exchange polymeric mate-... 

This material was first synthesized in the middle 1960s by E.I. Du Pont de Nemours and Co., and was soon recognized as an outstanding ion conductor for laboratory as well as for industrial electrochemistry. The perfluorinated polymeric backbone is responsible for the good chemical and thermal stability of the polymer. Nation membrane swollen with an electrolyte solution shows high cation conductivity, whereas the transport of anions is almost entirely suppressed. This so-called permselectivity (cf. Section 6.2.1) is a characteristic advantage of Nation in comparison with classical ion-exchange polymers, in which the selective ion transport is usually not so pronounced. 

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