Quality Assessment of the CL‐20/HMX Cocrystal Utilising Digital Image Processing,Propellants, Explosives, Pyrotechnics

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Quality Assessment of the CL‐20/HMX Cocrystal Utilising Digital Image Processing
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-01 , DOI: 10.1002/prep.202000341
Dirk Herrmannsdörfer ₁ , Thomas M. Klapötke ₂

Affiliation

The reduction of liquid and gas inclusions in the crystals is an effective strategy for the production of reduced sensitivity high explosives. Assessment of the achieved crystal quality is paramount for the improvement of the crystallisation techniques. Here we present the quality evaluation of the CL‐20/HMX cocrystal obtained from semibatch reaction cocrystallisation (SBRC), batch reaction cocrystallization (BRC), and antisolvent crystallisation by comparison of the results of digital image processing of photomicrographs of crystals immersed in an optically equally dense liquid, ¹H NMR, HPLC, GC, helium pycnometry, SEM, pXRD, and DSC. It was found that digital image processing is capable of differentiation between crystal qualities of batches that are indistinguishable by all the other listed methods. It presents itself as a very promising tool for crystal quality assessment and improvement. The analysis shows that SBRC can produce coarse crystals of the same quality on a pilot plant scale as antisolvent crystallisation on a laboratory scale.

中文翻译：

利用数字图像处理对CL‐20 / HMX共晶的质量评估

减少晶体中的液体和气体夹杂物是生产灵敏度降低的高炸药的有效策略。评估所获得的晶体质量对于改进结晶技术至关重要。在这里，我们通过比较半沉式反应共结晶（SBRC），间歇反应共结晶（BRC）和抗溶剂结晶获得的CL-20 / HMX共结晶的质量评估，该结果是通过对浸入光学显微镜的晶体显微照片的数字图像处理结果进行比较而得出同样稠密的液体，¹1 H NMR，HPLC，GC，氦比重瓶，SEM，pXRD和DSC。已经发现，数字图像处理能够区分批次的晶体质量，而这些质量在所有其他列出的方法中是无法区分的。它本身是非常有前途的晶体质量评估和改进工具。分析表明，SBRC可以在中试规模上生产与实验室规模的反溶剂结晶相同质量的粗晶体。

更新日期：2021-03-31

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