Zhao Xinhua, He Dan, Ma Xiaoping, Liu Xueying, Xu Zishuai, Chen Lizhen, Wang Jianlong
School of Chemical Engineering and Technology, North University of China Taiyuan 030051 China
Research Institute of Gan Su Yin Guang Chemical Industry Group Baiyin 730900 China.
RSC Adv. 2021 Oct 13;11(53):33522-33530. doi: 10.1039/d1ra05836c. eCollection 2021 Oct 8.
The sensitivity and properties of energetic materials strongly depend on their crystal morphology. In this article, spherical 1,1-diamino-2,2-dinitroethylene (FOX-7) was produced a combination of the cooling crystallization method and repeated grinding technique. X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), optical microscopy, scanning electron microscopy (SEM) and laser particle size analysis were used to characterize the structure, infrared characteristics, morphology, and particle size of the product. The results show that the obtained product has a smoother spherical morphology with granularity gradation and shows similar diffraction peak positions to raw FOX-7. Differential scanning calorimetry (DSC), thermal gravimetry (TG), and accelerating rate calorimetry (ARC) were used to analyse the thermal behavior of spherical FOX-7 under nonisothermal and adiabatic conditions. The thermal performance test results show that spherical FOX-7 releases energy faster and releases more energy as compared to raw FOX-7. These findings showed that the cooling crystallization method combined with the repeated grinding technique is suitable for efficient preparation of spherical FOX-7, which could greatly improve the thermal stability of FOX-7.
含能材料的灵敏度和性能强烈依赖于其晶体形态。在本文中，通过冷却结晶法和反复研磨技术相结合制备出了球形1,1 - 二氨基 - 2,2 - 二硝基乙烯（FOX - 7）。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT - IR）、光学显微镜、扫描电子显微镜（SEM）和激光粒度分析对产物的结构、红外特征、形态和粒度进行了表征。结果表明，所制备的产物具有更光滑的球形形态且粒度具有梯度分布，并且与原始FOX - 7具有相似的衍射峰位置。采用差示扫描量热法（DSC）、热重分析法（TG）和加速量热法（ARC）分析了球形FOX - 7在非等温及绝热条件下的热行为。热性能测试结果表明，与原始FOX - 7相比，球形FOX - 7释放能量更快且释放的能量更多。这些研究结果表明，冷却结晶法与反复研磨技术相结合适用于高效制备球形FOX - 7，这可以大大提高FOX - 7的热稳定性。
