1. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz (Germany), Fax: (+49) 6131‐379‐350
2. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai (P.R. China)
3. Present address: Evonik Degussa GmbH, Process Technology & Engineering, Process Technology—New Processes, Rodenbacher Chaussee 4, 63457 Hanau‐Wolfgang (Germany)