1. Laboratory for Characterization and Processing of Polymers, Institute for Textile Chemistry, Ekology and Colour Science, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, SloveniaTel.: , Fax:
2. Institute for Physical Chemistry, Karl Franzens University, Heinrichstraß;e 28, 8010 Graz, Austria