Nozzle‐Assisted Simultaneous Precipitation Method for Energetic FOX‐7/RDX Composite Microspheres with Improved Thermal Stability and Sensitivity,Crystal Research and Technology

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Nozzle‐Assisted Simultaneous Precipitation Method for Energetic FOX‐7/RDX Composite Microspheres with Improved Thermal Stability and Sensitivity
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/crat.202000015
Ruixuan Xu ₁ , Chongwei An _{1,

2} , Baoyun Ye _{1,

2} , Qian Liu ₁ , Jiechao Wang ₁ , Jingyu Wang _{1,

2}

Affiliation

Energetic 1,1‐diamino‐2,2‐dinitroethylene/hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (FOX‐7/RDX) composite crystals are fabricated via a newly introduced method named nozzle‐assisted simultaneous precipitation. Dimethyl sulfoxide is used as the solvent and FOX‐7/RDX composite crystals are prepared at different molar ratios of FOX‐7 and RDX. Regularly spherical FOX‐7/RDX particles are obtained under the 1:1 molar ratio of FOX‐7 and RDX and confirmed by field emission scanning electron microscopy. The result characterized by a laser particle size analyzer shows that the FOX‐7/RDX composite particles have a narrow particle size distribution with a median diameter of ≈1.57 µm. The structure of FOX‐7/RDX particles is confirmed using powder X‐ray diffraction and Fourier transform infrared spectroscopy, and the patterns suggest differences compared with FOX‐7/RDX mixture by mechanical mixing. Differential scanning calorimetry and thermal gravimetric test show an advanced decomposition peak temperature compared with raw FOX‐7 and RDX, and the apparent activation energy (E _a) of FOX‐7/RDX composite particles increases by 72.44 kJ mol⁻¹ than that of raw RDX. Furthermore, the characteristic drop height of FOX‐7/RDX composite particles increases to 61.9 cm, which is a 111.3% increasement compared to raw RDX, indicating an obviously significant improvement concerning mechanical safety.

中文翻译：

改进的热稳定性和灵敏度的高能FOX-7 / RDX复合微球的喷嘴辅助同时沉淀法

高能1,1-二氨基-2-，2-二硝基乙烯/六氢-1,3,5-三硝基-1,3,5-三嗪（FOX-7 / RDX）复合晶体是通过新引入的称为喷嘴辅助的方法制造的同时沉淀。使用二甲基亚砜作为溶剂，并以不同的FOX-7和RDX摩尔比制备FOX-7 / RDX复合晶体。在FOX-7和RDX的摩尔比为1：1的情况下可获得规则的球形FOX-7 / RDX颗粒，并通过场发射扫描电子显微镜确认。激光粒度分析仪表征的结果表明，FOX-7 / RDX复合颗粒的粒径分布较窄，中位直径约为1.57 µm。使用粉末X射线衍射和傅立叶变换红外光谱法确认了FOX-7 / RDX颗粒的结构，模式表明与通过机械混合的FOX-7 / RDX混合物相比有所不同。差示扫描量热法和热重分析表明，与原始FOX-7和RDX相比，分解峰温度更高，表观活化能（FOX-7 / RDX复合颗粒的E _a）比原始RDX增加了72.44 kJ mol ^-1。此外，FOX-7 / RDX复合颗粒的特征下落高度增加到61.9 cm，与原始RDX相比增加了111.3％，表明在机械安全性方面有明显的改善。

更新日期：2020-07-09

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