1. State Key Laboratory of Polymer Physics and Chemistry; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P. R. China
2. Life Science Research Center; Beihua University; Jilin 132013 P. R. China
3. Key Laboratory of Synthetic Rubber; Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 P. R. China