1. College of Polymer Science and Engineering, State Key
Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, P. R. China
2. Department of Macromolecular Science and
Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7202, United States
3. Army Research
Laboratory, RDRL-SED-C, 2800 Powder
Mill Road, Adelphi, Maryland 20783, United States
4. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P. R. China