1. Joint Research Network on Advanced Materials and Systems (JONAS), Freiburg Materials Research Center; University of Freiburg; Stefan-Meier-Str. 21, D- 79104 Freiburg Germany
2. Advanced Materials and Systems Research; BASF SE; Carl-Bosch-Strasse 38, D- 67056 Ludwigshafen Germany
3. Institute for Macromolecular Chemistry; University of Freiburg; Stefan-Meier-Str. 31, D- 79104 Freiburg Germany