1. Institute
of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569
Stuttgart, Germany
2. Institut
für Kunststofftechnik, University of Stuttgart, Böblingerstr. 70, D-70199
Stuttgart, Germany
3. Institute of Textile Chemistry and Chemical Fibers, Körschtalstr.
26, D-73770 Denkendorf, Germany