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. PSS Polymer Standards Service GmbH, In der Dalheimer Wiese 5, 55120 Mainz, Germany