1. Department of Polymer Engineering, University of Bayreuth, Universitätsstraße 30, D - 95447, Bayreuth, Germany
2. Department of Polymer Engineering, University of Bayreuth, Universitätsstraße 30, D - 95447, Bayreuth, Germany,
3. BASF Aktiengesellschaft, Kunststofflabor, D - 67056, Ludwigshafen, Germany