摘要 |
Sulfonated polyimides, ion-exchange membranes and fuel cells are new. Sulfonated polyimides are formed of sequences or blocks represented by formulae (Ix) and (Iy) x = at least 4, preferably 4-15; y = at least 5, preferably 5-40; C1 and C2 = identical or different tetravalent groups comprising at least one 6-10C aromatic cycle, optionally substituted and/or 5-10 atoms heterocycle of aromatic type, optionally substituted, and comprising one or more heteroatoms selected from S, N and O; with C1 and C2 each forming 5 or 6 atoms cycles with adjacent imide groups; Ar1 and Ar2 = identical or different divalent group comprising at least one 6-10C aromatic cycle, optionally substituted and/or 5-10 atoms heterocycle of aromatic type, optionally substituted, and comprising one or more heteroatoms selected from S, N and O, with at least one of aromatic cycles and/or heterocycles of Ar2 substituted with at least one sulfonic group . Sulfonated polyimide has general formula (I) C1, C2, Ar1, Ar2, x and y = as described for (Ix) and (Iy); R2 and R2 = NH2 or group (II); C3 = divalent group comprising at least one 6-10C aromatic cycle, optionally substituted and/or 5-10 atoms heterocycle of aromatic type, optionally substituted, and comprising one or more heteroatoms selected from S, N and O; and it forms 5 or 6 atoms cycle with adjacent imide group; z = 1-10 (Full definitions given in DEFINITIONS (Full definitions) Field). Independent claims are also included for 1) membrane comprising sulfonated polyimide as claimed; and 2) fuel cell comprising at least one membrane as claimed. |