Institution: | 1. Present address: Degussa AG, Process Technology & Engineering, Process Technology—New Processes, Rodenbacher Chaussee 4, D‐63457 Hanau‐Wolfgang, Germany;2. Max‐Planck‐Institut für Polymerforschung, Ackermannweg 10, D‐55128 Mainz, Germany, Fax: (+49)?6131‐379‐350 |