1. State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy
of Sciences, Changchun 130022, P. R. China
2. University
of Chinese Academy of Sciences, Beijing 100049, P. R. China
3. Polymer Materials Research Center and Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China