1. Thuringian Institute for Textile and Plastics Research; 07407 Rudolstadt Germany
2. Graz University of Technology; Institute for Chemistry and Technology of Materials; 8010 Graz Austria
3. University of Maribor; Institute for the Engineering and Design of Materials; 2000 Maribor Slovenia
4. University of Leoben; Institute for Physics; Franz-Josef-Str. 18 8700 Leoben Austria