1. School of Polymer Science and Engineering; Qingdao University of Science and Technology; Zhengzhou Rd. 53 CN-266042 Qingdao China
2. Institute of Pharmaceutical Technology and Biopharmacy; University of Münster; Corrensstr. 48 D-48149 Münster Germany
3. Department of Chemistry; Paderborn University; Warburger Str. 100 D-33098 Paderborn Germany