1. Institute of Polymer Science and Engineering, School of Chemical Engineering and Technology, Hebei University of Technology; Tianjin 300130 China
2. Key Lab for Micro- and Nano-Scale Boron Nitride Materials in Hebei Province, Hebei University of Technology; Tianjin 300130 China
3. National Institute for Materials Science (NIMS); 1-2-1 Sengen Tsukuba-city Ibaraki 305-0047 Japan