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. Department of ChemistryNortheast Normal University Changchun Jilin 130022 P. R. China
4. Department of DermatologyChina‐Japan Union HospitalJilin University Changchun Jilin 130033 P. R. China
5. Jilin Biomedical Polymers Engineering Laboratory Changchun 130022 P. R. China