1. National Engineering Technology Research Centre of Flame Retardant Materials School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P. R. China
2. Beijing Kay Laboratory of Environmental Science and Engineering School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 P. R. China
3. National Engineering Laboratory for Carbon Fibre Preparation Technology Ningbo Institute of Material Technology & Engineering Chinese Academy of Science Ningbo 315201 P. R. China
4. Kingfa Science & Technology Company Guangzhou 510520 P. R. China