Characterization and Properties of F(2602)/GAP/CL-20 Energetic Fibers with High Energy and Low Sensitivity Prepared by the Electrospinning Method

[Image: see text] In this work, three samples of fluoroelastomers/glycidyl azide polymer/hexanitrohexaazaisowurtzitane (F(2602)/GAP/CL-20) energetic fibers with F(2602)/GAP:CL-20 ratios of 1:9, 2:8, and 3:7 were prepared by the electrospinning method. The morphologies and structures of the samples were characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The results revealed that F(2602)/GAP/CL-20 energetic fibers showed a three-dimensional network structure, and four elements C, N, O, and F were observed on the surface. The surface of the fiber F(2602)/GAP:CL-20 = 1:9 was uniform and smooth. Differential scanning calorimetry was used to analyze the thermal decomposition properties of the samples. The apparent activation energy of the F(2602)/GAP/CL-20 energetic fiber was 399.86 kJ/mol, indicating high thermal stability. TG-MS analysis results show that the thermal decomposition products of F(2602)/GAP/CL-20 are mainly C(2)H(6), H(2)O, N(2,) and CO(2). The results of the energy performance evaluation showed that the standard specific impulse (I(sp)) of F(2602)/GAP/CL-20 was 2668.1 N s kg(–1), which was remarkably higher than I(sp) of the state-of-the-art AP/HTPB/Al propellant. In addition, compared to that of CL-20, the friction sensitivity of one F(2602)/GAP/CL-20 sample decreased by 38%, and the sensitivities of the other two F(2602)/GAP/CL-20 samples were even less than zero. F(2602)/GAP/CL-20 fibers also exhibited a higher feature height. Therefore, these kinds of CL-20-based fibers are high-energy materials with very low sensitivity.