1. Beijing
National Laboratory for Molecular Sciences, Key Laboratory of Polymer
Chemistry and Physics of Ministry of Education, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
2. Polymer
Materials Research Center, College of Materials Science and Chemical
Engineering, Harbin Engineering University, Harbin 150001, China
3. Key
Laboratory of High Performance Ceramic Fibers of Ministry of Education,
College of Materials, Xiamen University, Xiamen 310065, China