Combination of Electrografting and Ring-Opening Metathesis Polymerization: An Efficient Way to Prepare Polynorbornene Brushes on Conducting Substrates The authors thank the "Services Fédéraux des Affaires Scientifiques, Techniques et Culturelles" for general support under the auspices of the "Poles d'Attraction Interuniversitaires: Supramolecular Catalysis and Supramolecular Chemistry". C.J. is "Chargé de Recherche" at the "Fonds National pour la Recherche Scientifique" (FNRS).