1. Xi'an Modern Chemistry Research Institute Xi'an 710065 P. R. China
2. State Key Laboratory of Fluorine & Nitrogen Chemicals Xi'an 710065 P. R. China
3. Department of Applied Chemistry, School of ScienceNorthwestern Polytechnical University Xi'an 710129 P. R. China
4. Science and Technology on Combustion, Thermal Structure and Internal Flow LaboratoryNorthwestern Polytechnical University Xi'an 710072 P. R. China