Decreasing the hygroscopicity of ammonium dinitramide (ADN) through cocrystallization
Decreasing the hygroscopicity of ammonium dinitramide (ADN) through cocrystallization
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DOI：
10.1016/j.enmf.2022.03.001
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发表时间：
2022-06-01
影响因子：
--
通讯作者：
Yang, Zong-wei
中科院分区：
文献类型：
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作者：
Qiao, Shen;Li, Hong-zhen;Yang, Zong-wei
为了降低含能氧化剂ADN的吸湿性，采用溶剂蒸发法制备了ADN与18-C6（18-冠-6）按1：1摩尔比共结晶的共晶体。ADN/18 C6共晶的结构，这已被证实使用单X射线衍射（SXRD），表明该共晶的形成归因于铵离子和冠醚环之间的强分子间氢键相互作用。ADN/18 C6共晶的熔点为151.5 ℃，明显高于其各自组分的熔点：ADN的93.6 ℃和18 C6的43.2 ℃。值得注意的是，与ADN相比，ADN/18 C6共晶体几乎不吸湿。在相对湿度60%、温度30 ℃的空气中放置12 h，共晶的吸湿率为0.9%。相比之下，ADN在相同条件下的吸湿率为18%。此外，ADN/18 C6共晶的撞击灵敏度为18 J，这显著低于原始ADN的撞击灵敏度（2.5 J）。结果表明，共结晶是降低ADN吸湿性的有效途径。
To decrease the hygroscopicity of ADN-a energetic oxidizer, this study developed a new cocrystal composed of ADN and 18C6 (18-crown-6) at a 1:1 M ratio through cocrystallization using the solvent evaporation method. The structure of the ADN/18C6 cocrystal, which has been confirmed using single X-ray diffraction (SXRD), indicates that the formation of this cocrystal is attributed to the strong intermolecular hydrogen bond interactions between ammonium ions and crown ether cycles. The ADN/18C6 cocrystal has a melting point of 151.5 & DEG;C, which is significantly higher than those of its respective components: 93.6 & DEG;C of ADN and 43.2 & DEG;C of 18C6. Notably, the ADN/18C6 cocrystal is nearly non-hygroscopic compared with ADN. The cocrystal's hygroscopicity rate is 0.9% when exposed to the air with relative humidity (RH) of 60% and a temperature of 30 & DEG;C for 12 h. By comparison, ADN's hygroscopicity rate is 18% under the same conditions. In addition, the impact sensitivity of the ADN/18C6 cocrystal is 18 J, which is substantially lower than that of raw ADN (2.5 J). These results show that cocrystallization offers an effective way to reduce the hygroscopicity of ADN.