| abstract |
A compound having the formula: <IMAGE> where A- is a counterion; R1, R2, R3, and R4, independently, comprise (a) a non-fluorinated alkyl, cycloalkyl, aryl, or aralkyl group; (b) an onium-containing group; or (c) a group having the formula -(CH2)n-Y-R5 in which n is at least two; Y is a spacer arm comprising a -CH2-, -O-, -OCH2-, -S-, -SO2-, or -Z-SO2- group; Z is an -R6-O-, -N(R7)- group, or -N(H)-; R6 is a substituted or unsubstituted phenylene group; R7 is H or a non-fluorinated alkyl, cycloalkyl, aryl, or alkaryl group; and R5 is a fluorinated group, perfluorinated group, or combination thereof, with the proviso that (i) at least one of R1, R2, R3, and R4 comprises a group having the formula -(CH2)n-Y-R5; and (ii) the total number of fluorine atoms in said compound is at least 5. The invention further includes curable compositions comprising vinylidene fluoride-containing polymers and the above-described compounds, as well as a method for curing such compositions. |