Accession Number : ADA258542


Title :   Influence of the Sulfonate Countercation on the Thermal Stability of Nafion (Trade name) Perfluorosulfonate Membranes


Descriptive Note : Technical rept. no 79


Corporate Author : COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY


Personal Author(s) : Martin, Charles R ; Feldheim, Daniel L ; Lawson, Del R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258542.pdf


Report Date : 21 Dec 1992


Pagination or Media Count : 17


Abstract : We report in this paper a strong dependence of the thermal stability of Nafion perfluorosulfonate ionomer on the nature of the counterion associated with the fixed sulfonate site. These results were obtained using thermal gravimetric analysis on a series of alkali metal and alkyl ammonium cation- exchanged Nafion films. We have found that the temperature of decomposition of Nafion is inversely dependent on the size of the exchanged cation; i. e. Nafion films show improved thermal stability as the size of the counter cation decreases. We attribute this inverse relationship of thermal stability with counterion size to an initial decomposition reaction which is strongly influenced by the strength of the sulfonate-counterion interaction....Nafion, Thermal stability.


Descriptors :   *CATIONS , *THERMAL STABILITY , *IONOMERS , *SULFONATES , INTERACTIONS , DECOMPOSITION , ALKYL RADICALS , ALKALI METALS , ION EXCHANGE , AMMONIUM COMPOUNDS , THERMAL ANALYSIS , GRAVIMETRIC ANALYSIS , POLYMERS


Subject Categories : Organic Chemistry
      Physical Chemistry
      Polymer Chemistry
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE