1. Department
of Polymer Science and Engineering, Hebei University of Technology, No. 8 Guangrong Road, Hongqiao District, Tianjin 300130, China
2. The
WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department
of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea
3. Institute
for Technical and Macromolecular, University of Hamburg, Bundesstrasse
45, D-20146 Hamburg, Germany