Preparation and Properties of Superfine NC/GAPE/CL-20 Energetic Composite Fibers

NC/GAPE/CL-20 Energetic composite fibers were prepared by using an electrospinning technique. The morphology and structure of the composite fibers were characterized by using SEM, EDS, XRD, IR, XPS and BET. In addition, the thermal behaviors of the composites were carried out, the mechanical sensitivity of the sample was tested, and its energy properties were also calculated. The results show that the bonding system NC/GAPE combines well with the explosive CL-20, and the average diameter of the fiber is about 620nm with the specific surface area of 5.2648m2/g. The elements and molecular structure of fiber on the surface are consistent with those of the raw materials, and no new chemical bonds are formed. However, the crystal form of CL-20 in the composite fiber is transformed from ε-CL-20 to β-CL-20. The results of DSC analysis show that the thermal decomposition activation energy of the composite fiber is 216.03kJ/mol, which increases by 22.47kJ/mol than that of the raw material CL-20. The TG-MS results show that the thermo-gravimetric process of the composite fiber is fast, and the main decomposition products are N2, CO, NO, and H2O. Additionally, a small amount of CO2, CH4, N2O, H2 are formed. The sensitivity test results show that, compared to the raw material CL-20, the composite fiber has lower impact and friction sensitivity. In terms of energy properties, the detonation velocity of the composite fiber is 9365m/s, which is similar to that of raw material CL-20, and the explosion heat of the composite fiber (6027kJ/kg) is lower than that of the raw material CL-20 (6158kJ/kg), and the standard specific impulse and characteristic velocity of the composite fiber are 2573.7N•s/kg and 1631.5m/s, respectively, which are slightly lower than those (2673.8N•s/kg and 1638.6m/s) of raw material CL-20, showing that the composite fiber has higher energy performance and lower methanical sensitivity. © 2021, Editorial Board of Journal of Explosives & Propellants. All right reserved.