Electrostatic Spraying Preparation and Performance of Nanocomposite Energetic Material RDX@NGEC

doi:10.12382/bgxb.2022.0228

Abstract

Abstract:

In this study, RDX and nitrate glycerol ether cellulose (NGEC) were selected as the raw materials, and acetone as the solvent to prepare precursor solution. A novel RDX@NGEC core-shell structured nanocomposite energetic material was prepared using the electrostatic spray drying technology. The structure and composition of the composite were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Raman spectroscopy (Raman). Differential scanning calorimetry (DSC) was carried out to analyzed the thermal decomposition reaction kinetics and thermodynamics of the composites using the Kissinger and the Ozawa methods. In addition, impact and friction sensitivity experiments were carried out to study the mechanical properties of the composite. The results showed that the particle size of the composite RDX@NGEC prepared by electrostatic spray drying technology exhibited uniform distribution and an even spherical morphology, forming a typical core-shell structure. Besides, compared with the raw material RDX, the activation energy (E_a) of the composite increased from 122.05kJ/mol to 131.70kJ /mol, with E_a gradually increasing as the NGEC content increased. The addition of an appropriate amount of NGEC significantly increased the critical temperature of thermal explosion for the composite from 513.696K to 524.989K, thereby enhancing the safety performance.

Key words: nano-energetic composite materials, electrostatic spray, thermal decomposition, sensitivity, RDX@NGEC

LI Qiang, CHEN Ling, GAN Huaiyin, ZHU Yongchen, HE Weidong. Electrostatic Spraying Preparation and Performance of Nanocomposite Energetic Material RDX@NGEC[J]. Acta Armamentarii, 2023, 44(7): 1985-1992.

Figures/Tables 8

Fig.1 Preparation of the RDX@NGEC composite

Fig.2 SEM images of raw materials and the composite particles

Fig.3 FTIR spectra curves of raw materials and the composite particles

Fig.4 XRD curves of raw materials and the composite particles

Fig.5 Raman spectra of raw materials RDX, NGEC, and composite particles RDX@NGEC-1 and RDX@NGEC-2

Fig.6 DSC trajectories (top) of NGEC, RDX, RDX@NGEC-1, RDX@NGEC-2 at different heating rates and the linearity of the thermodynamic calculations by Kissinger and Ozawa (bottom) methods, respectively Fitting graph

Table 1 Thermodynamics, kinetics and thermal stability parameters

样品	T_p/K	热力学参数			动力学参数				热稳定性
样品	T_p/K	ΔH^≠/ (kJ·mol^-1)	ΔG^≠/ (kJ·mol^-1)	ΔS^≠/ (J·mol^-1·K^-1)	E_a/(kJ·mol^-1) Kissinger	E_a/(kJ·mol^-1) Ozawa	lnA_k	k	T_b/K
NGEC	465.3	133.063	122.840	21.970	136.931	137.898	33.545	0.157	479.245
RDX	495.72	117.929	131.285	-26.942	122.050	124.261	27.725	0.151	513.696
n-RDX	502.96	133.224	149.005	-31.376	137.406	138.900	27.207	0.00351	519.276
1	507.59	127.481	149.556	-43.490	131.701	133.493	25.759	0.00430	524.989
2	496.07	133.081	149.900	-33.904	137.206	138.749	26.889	0.00170	511.952

Fig.7 Mechanical sensitivity of the samples

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