1 Transportation Security Laboratory, William J. Hughes Technical Center, Atlantic City, NJ, USA.
2 Penn State University, University Park, PA, USA.
Appl Spectrosc. 2018 Jan;72(1):28-36. doi: 10.1177/0003702817712259. Epub 2017 Aug 25.
The polymorphic phase of 1,3,5-trinitro-1,3,5-triazine (RDX) was examined as a function of mass loading, solvent, and sample deposition technique. When RDX was deposited at a high mass loading, the vibrational modes in the obtained Raman spectra were indicative of concomitant polymorphism as both the α-RDX and β-RDX phases were present. At low mass loadings, only β-RDX was observed regardless of solvent when using the drop cast crystallization method. However, α-RDX (the thermodynamically stable polymorphic phase observed with visible quantities of the explosive) was observed when RDX deposits were dry transferred. Observation of α-RDX was independent of the initial mass loading or the initial deposition solvent when using the dry transfer methodology. These data indicate that the use of the dry transfer preparation method can be used to successfully prepare RDX-based test articles with the α-RDX phase regardless of the solvent used to initially dissolve the RDX, the initial deposition technique, or the mass loading.
1,3,5-三硝基-1,3,5-三嗪（RDX）的多晶型相作为质量负载、溶剂和样品沉积技术的函数进行了研究。当 RDX 以高质量负载沉积时，获得的拉曼光谱中的振动模式表明存在伴随的多晶型现象，因为同时存在α-RDX 和β-RDX 相。在低质量负载下，无论使用滴铸结晶法时使用何种溶剂，都只观察到β-RDX。然而，当 RDX 沉积物干燥转移时，观察到α-RDX（用可见量的爆炸物观察到的热力学稳定多晶型相）。当使用干燥转移方法时，观察到α-RDX 与初始质量负载或初始沉积溶剂无关。这些数据表明，无论初始溶解 RDX 的溶剂、初始沉积技术或质量负载如何，使用干燥转移制备方法都可以成功制备具有α-RDX 相的 RDX 基试验品。
