1. Institute of Polymer Materials, Department of Materials Science, University Erlangen-Nürnberg, Martensstr. 7, D-91058 Erlangen, Germany
2. School of Semiconductor and Chemical Engineering, Chonbuk National University, Baekjero 567, Deokjin-gu, Jeonju, Jeonbuk 561-756, Republic of Korea
3. Institute of Technical and Macromolecular Chemistry, University Hamburg, Bundesstr. 45, D-20146 Hamburg, Germany