1. Institute of Material Science and Engineering; West Pomeranian University of Technology; PL-70310 Szczecin Poland
2. Institute of Physics; West Pomeranian University of Technology; PL-70310 Szczecin Poland
3. Polymer Institute; West Pomeranian University of Technology; 70-322 Szczecin Poland
4. Institute of Lightweight Engineering and Polymer Technology; Technische Universität Dresden; 01307 Dresden Germany