1. Johnson Polymer, Innovatielaan 1, NL-8440 AJ, Heerenveen, The Netherlands
2. Department of Chemical Engineering, Illinois Institute of Technology, Chicago, Illinois 60616
3. Swiss Federal Institute of Technology Zurich, Laboratorium für Techniche Chemie/LTC, ETH−Hönggerberg/HCl, CH-8093 Zurich, Switzerland