1. Faculty of Chemistry, TU Dortmund, Otto-Hahn-Str. 6, 44227 Dortmund, Germany
2. Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, 7602 Matieland, South Africa
3. German Institute for Polymers, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
4. Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany