1. Faculty of Chemistry, TU Dortmund, Otto-Hahn-Straße
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