Fluoropolymer compositions containing a nitrogen cure site monomer and a sulfone or sulfoxide compound

A composition comprising:

• (a) a fluoropolymer comprising interpolymerized units derived from a nitrogen-containing cure site monomer and less than about 10 mole percent of interpolymerized units derived from hydrogen-containing monomers;
• (b) a catalyst composition comprising at least one anionic functional group having the formula:
• R(A(−))n
• wherein A is an anionic acidic group or anionic derivative of an acidic group, n is 1-10, wherein R is hydrogen or a C1-C20 alkyl, alkenyl, alkylene, alkenylene, or higher-functional organic moiety, cyclic, aryl, or a combination thereof, wherein R is nonfluorinated, partially fluorinated, or perfluorinated, and wherein, when n is 2, R may be a direct bond between two A groups.
• and comprising at least one cationic functional group having the formula:
• QR′k(+)
• wherein Q is selected from phosphorous, sulfur, nitrogen, arsenic, or antimony, wherein each R′ is independently selected from hydrogen and a nonfluorinated, partially fluorinated, or perfluorinated, C1-C20 alkyl, aryl, aralkyl, or alkenyl group, and wherein k is the valence of Q plus one;
• wherein the catalyst composition is a compound or the precursors thereof added separately or as a mixture;
• (c) a composition having the formula:
• R″2SOx
• wherein each R″ is independently C1-C30 alkyl, aralkyl, the R″ groups together form a heterocyclic C3-C30 cycloalkyl, aryl, or aralkyl, each R″ is optionally nonfluorinated, partially fluorinated, or perfluorinated, and x is 1 or 2.