1. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, A-8700, Leoben, Austria
2. Department of Applied Science and Technology, Politecnico di Torino, Duca degli Abruzzi, 24, 10124, Torino, Italy
3. Institute of Physics, University of Graz, Universitätsplatz 3, 8010, Graz, Austria