Proton conducting membranes for fuel cells having a proton gradient and methods for preparing said membranes

Method for preparing a proton-conducting membrane comprising exclusively a graft (co)polymer comprising a main chain and grafts bonded covalently to said main chain, said grafts comprising at least one proton acceptor group and at least one proton donor group, wherein the graft (co)polymers are prepared by radiografting.

Method for preparing a proton-conducting membrane comprising exclusively a graft (co)polymer comprising a main chain and grafts bonded covalently to said main chain, said grafts comprising at least one proton acceptor group and at least one proton donor group, comprising the following steps:

• a step of producing said graft (co)polymers in the through-pores of a polymeric support matrix;
• a step of removing said polymeric support matrix.

Method for preparing a proton-conducting membrane comprising exclusively a graft (co)polymer comprising a main chain and grafts bonded covalently to said main chain, said grafts comprising at least one proton acceptor group and at least one proton donor group, further, including a polymeric support matrix comprising through-pores, said pores being filled in by a graft (co)polymer wherein the graft (co)polymers are produced in the through-pores of a polymeric support matrix.

Fuel cell device comprising at least one membrane comprising exclusively a graft (co)polymer comprising a main chain and grafts bonded covalently to said main chain, said grafts comprising at least one proton acceptor group and at least one proton donor group.