| abstract |
Sulfonated block copolymers that may be used as membranes for fuel cells include sulfonated polyaryletherketone blocks and lightly sulfonated polyethersulfone blocks. n The sulfonated polyaryletherketone blocks include structural units of formula n nand the lightly sulfonated polyethersulfone blocks include structural units of formulan n nwhereinn R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are independently C 1 -C 10 alkyl, C 3 -C 12 cycloalkyl, C 6 -C 14 aryl, allyl, alkenyl, alkoxy, halo, or cyano; Z, Z 1 and Z 2 are independently a direct bond or O, S, (CH 2 ) r , (CF 2 ) r , C(CH 3 ) 2 , C(CF 3 ) 2 , or a combination thereof; M is H, a metal cation, a non-metallic inorganic cation, an organic cation or a mixture thereof; a and e are independently 0 or an integer from 1 to 3; b, c, d, and f are independently 0 or an integer from 1 to 4; m, n and p are independently 0 or 1; and r is an integer from 1 to 5. |