1. Institute of Chemistry of New Materials Center of Physics & Chemistry of New Materials University of Osnabrück Barbarastr. 7 49069 Osnabrück Germany
2. Current address: Univ. Bordeaux CNRS Bordeaux INP ISM, UMR 5255 33607 Pessac France
3. Ernst-Berl Institut fur Technische und Makromolekulare Chemie Technische Universität Darmstadt Alarich-Weiss-Str. 4 64287 Darmstadt Germany
4. Chair in Polymer Chemistry Saarland University Campus Saarbrücken C4 2 66123 Saarbrücken Germany
5. ISM, UMR 5255 Univ. Bordeaux 351 Cours de la Libération 33405 Talence Cedex France