Patent ID: 7868124

Claim:
A polymer, the skeleton of which consists of at least one phenylene repeating unit of formula (I) below: and of at least one phenylene repeating unit of formula (II) below: in which: the groups R 1 , R 2 and R 3 , which may be identical or different, represent a hydrogen atom, a halogen atom, an alkyl group, an aryl group, a perfluoroalkyl group or a perfluoroaryl group; the group E represents a single bond or a group chosen from —(C═O)—, —P(═O)— and —SO 2 —; the group W 1 represents an arylene group or a perfluoroarylene group; the group A represents a group chosen from —O—, —S—, —NH— and —NR 9 —, R 9 being an alkyl group; the group W 2 represents an aryl group substituted with at least one substituent chosen from F, —O—SO 2 -Aryl, —S(═O)-Aryl or represents a perfluoroaryl group; the groups R 4 , R 5 , R 6 , R 7 and R 8 , which may be identical or different, represent a group chosen from: a hydrogen atom, a halogen atom, an —OH group, a group -M(R 10 ) 3 with R 10 representing an alkyl group and M a metal chosen from Si, Sn and Ge; a group —P(═O)(OR 11 ) 2 with R 11 representing an alkyl group; an aryl group, a group —O-Aryl, a group —SO 2 -aryl, an alkylaryl group, a perfluoroalkyl group or a perfluoroalkylaryl group, said alkyl, perfluoroalkyl and perfluoroalkylaryl groups optionally comprising in their chain one or more oxygen, nitrogen and/or sulfur atoms; a perfluoroaryl group or a group —O-perfluoroaryl, said perfluoroalkyl, perfluoroaryl, perfluoroalkylaryl and —O-perfluoroaryl groups optionally bearing a group chosen from —SO 3 H, —PO 3 H 2 and —CO 2 H; an —SO 3 H group, a —PO 3 H 2 group or a —CO 2 H group; on condition that at least one of the groups R 4 , R 5 , R 6 , R 7 and R 8 represents a group chosen from —SO 3 H, —PO 3 H 2 and —CO 2 H groups, perfluoroalkyl groups, perfluoroalkylaryl groups optionally comprising in their chain one or more oxygen, nitrogen and/or sulfur atoms, perfluoroaryl groups and —O-perfluoroaryl groups, these perfluoro groups bearing a group chosen from —SO 3 H, —PO 3 H 2 and —CO 2 H, said —SO 3 H, —PO 3 H 2 and —CO 2 H groups possibly being in the form of alkali metal salts.