the present invention provides a separating material producable by a ) providing a solid substrate , having amino - functional groups coupled to the substrate surface , b ) covalently coupling of the amino - functional groups with a thermally labile radical initiator , c ) contacting the substrate surface with a solution of polymerizable monomers under conditions , where thermally initiated graft copolymerization of the monomers takes place , to form a structure of adjacent functional polymer chains on the surface of the substrate . the present invention further provides a method for the production of a separating material by a ) providing a solid substrate , having aminofunctional groups coupled to the substrate surface , b ) covalently coupling of the aminofunctional groups with a thermally labile radical initiator , c ) contacting the substrate surface with a solution of polymerizable monomers under conditions , where thermally initiated graft copolymerization of the monomers takes place , to form a structure of adjacent functional polymer chains on the surface of the substrate .