| abstract |
Copolymers comprising at least one recurrent unit of the following formula (I) are provided: n nand at least one recurrent unit of the following formula (II):n n nwherein:n R 1 is an alkylene group; Z is a —PO 3 R 3 R 4 , R 3 and R 4 representing independently of each other, a hydrogen atom an alkyl group, a cation; X and Y represent, independently of each other, a halogen atom, a perfluorocarbon group. |