1. Macromolecular Chemistry, Department Chemistry and Biology, University of Siegen, Adolf-Reichwein-Strasse 2, 57076 Siegen, Germany
2. Université de Brest (UBO), UMR CNRS 6521, 6 Avenue Le Gorgeu, C.S., 93837-29238 Brest CEDEX 3, France
3. Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany