1. Key Laboratory of Polymer EcomaterialsChangchun Institute of Applied ChemistryChinese Academy of Sciences Changchun 130022 P. R. China
2. University of Chinese Academy of Sciences Beijing 100049 P. R. China
3. The University of KitakyushuDepartment of Chemistry and Biochemistry 1‐1, Hibikino, Wakamatsu‐ku Kitakyushu 808‐0135 Fukuoka Japan