1. University of Twente, Department of Chemical Technology, P.O. Box 217, 7500 AE Enschede, The Netherlands
2. Eindhoven University of Technology, WFW, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
3. Institute of Polymer Research, University of Waterloo, Ontario, Canada N2L 3G1
4. Universität Ulm, Organische Chemie III/Makromolekulare Chemie, D-89069 Ulm, Germany