1. a Institute of Chemistry Chemical Research Center Hungarian Academy of Sciences , P.O. Box 17, H-1525, Budapest, Hungary
2. b Technical University of Budapest, Department of Plastics and Rubber Technology , P.O. Box 92, H-1521, Budapest, Hungary
3. c Martin Luther University Halle-Wittenberg, Department of Material Science Geusaer , Straße, D-06217, Merseburg, Germany