Polyphenylene-type polymers with phenylene side groups substituted with groups or perfluorinated chains carrying sulfonic or other acid groups, used for the production of membranes, especially for fuel cells

摘要

Polymers with phenylene units, at least one of which has a lateral phenylene group substituted with a group or perfluorinated chain carrying a sulfonic acid, phosphonic acid or carboxylic acid group. Polymers with phenylene units of formula (I) and (II), where at least one of which has a lateral phenylene group substituted with a group or perfluorinated chain carrying a sulfonic acid, phosphonic acid or carboxylic acid group. R1, R2, R3 = H, halogen, alkyl, aryl, perfluoroalkyl or perfluoroaryl; E = a single bond, -CO-, -P(O)- or -SO2-; W1 = arylene or perfluoroarylene; A = -O-, -S-, -NH- or -NR9-; R9 = alkyl; W2 = aryl (substituted with F, -OSO2-aryl or -SO-aryl), or perfluoroaryl; R4-R8 = (a) H, halogen, OH, or -M(R10)3, (b) -P(O)(OR11)2, (c) aryl, aryloxy, -SO2-aryl, or alkyl-aryl, perfluoroalkyl or perfluoroalkylaryl (the last three optionally with in-chain O, N and/or S atom(s)), (d) perfluoroaryl or perfluoroaryloxy (optionally substituted with -SO3H, -PO3H2 or -COOH), or (e) an -SO3H, -PO3H2 or -COOH group, with the proviso that at least one of these groups is selected from -SO3H, -PO3H2, -COOH, perfluoroalkyl, perfluoroalkylaryl (optionally with in-chain O, N and/or S), perfluoroaryl and perfluoroaryloxy (optionally substituted as above), and that the acid groups may be in the form of their alkali metal salts; R9, R10 = alkyl; and M = Si, Ge or Sn. Independent claims are also included for the following: (1) Method for the production of these polymers by reacting a base polymer comprising repeat units (II) with compound(s) of formula Ar-A2 (III); (2) Membranes containing sulfonated polymers as above; and (3) Fuel cells containing these membranes. Ar = a phenyl group substituted with groups R4-R8 as above; and A2 = OH, SH, NH2 or -NHR9, said group being capable of the nucleophilic substitution of a group attached to W2, i.e. F, -OSO2-aryl or -S(O)-aryl.