1. School of Chemistry & Chemical Engineering, Key Laboratory of Environment-Friendly Polymeric Materials of Anhui Province, Anhui University, Hefei, P.R. People’s Republic of China
2. National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei, P.R. People’s Republic of China
3. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, P.R. People’s Republic of China