1. Engineering Laboratory of non-halogen flame retardants for polymers, School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Fucheng Road 11, Haidian District, Beijing 100048, P. R. China
2. National Laboratory of Flame Retardant Materials, National Engineering and Technology Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, P. R. China