1. Chengdu Institute of Organic Chemistry; Chinese Academy of Sciences; Chengdu 610041 P. R. China
2. School of Chemical Engineering; Sichuan University of Science and Engineering; Zigong 643000 P. R. China
3. College of Material and Chemical Engineering; Tongren University; Tongren 554300 P. R. China
4. Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P. R. China