اثر میکرو دانه‌های β-HMX بر کنترل مورفولوژی HMX خام تهیه شده از طریق فرایند نیتراسیون بکمن اصلاح‌شده
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Abstract:
In the synthesis of hexamethylenetetranitramine (HMX) by Bachmann method, the morphology of crude HMX products are needle-like with alpha polymorph. This quality of materials leads to separation of α-HMX from final suspension to be time-consuming and difficult. On the other hands, crude product of α-HMX are the more sensitive and unsafe than β-HMX. Herein, a seeding strategy was developed in the synthesis of HMX by hexamine and 1,5-dinitroendomethylene-1,3,5,7-tetraazacyclooctane (DPT) as raw materials, to control the polymorphism of the crude products from a to b type, and their morphology from needle-like to spherical shape. Therefore, the microparticles of β-HMX, as micro-seeds, were added to the nitrator in the various steps of production process from hexamine and DPT reactants, then the yield of process was determined and morphology of products were characterized using X-ray diffraction spectroscopy (X-ray) and optical microscopy. The results show that this interesting technique can control the polymorphism and structure of crude HMX from a to b type, improving the safety of crude product and its filtration time. Also, micro-seeding provides a useful conditions to the preparation and crystallization of β-HMX.
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اثر میکرو دانه های β-hmx بر کنترل مورفولوژی hmx خام تهیه شده از طریق فرایند نیتراسیون بکمن اصلاح شده
در سنتز ماده منفجره هگزامتیلنتترانیترامین (hmx) به روش بکمن، مورفولوژی ذرات hmx خام تولیدی سوزنی شکل و پلیمورف آن آلفا (α) است که در مرحلهی جداسازی محصول از سوسپانسیون نهایی، ایجاد یک کیک نفوذناپذیر کرده و منجر به افزایش قابل توجه زمان فرایند فیلتراسیون مواد خام می گردد. از طرفی ذرات α-hmx نسبت به ضربه و اصطکاک حساستر از β-hmx و غیر ایمنتر می باشند. عوامل بیان شده سبب افزایش زمان تولید، کا...
full textMechanical properties of β-HMX
BACKGROUND For a full understanding of the mechanical properties of a material, it is essential to understand the defect structures and associated properties and microhardness indentation is a technique that can aid this understanding. RESULTS The Vickers hardness on (010), {011} and {110} faces lay in the range of 304-363 MPa. The Knoop Hardnesses on the same faces lay in the range 314-482 M...
full textGrowth and dislocation studies of β-HMX
BACKGROUND The defect structure of organic materials is important as it plays a major role in their crystal growth properties. It also can play a subcritical role in "hot-spot" detonation processes of energetics and one such energetic is cyclotetramethylene-tetranitramine, in the commonly used beta form (β-HMX). RESULTS The as-grown crystals grown by evaporation from acetone show prismatic, t...
full textThermal Decomposition Process of HMX
Der thermische Zersetzungsproze8 bei BMX Die thermische Zersetzung von HMX wurde untersucht oberhalb und unterhalb seines Schmelzpunktes unter Einsatz der Thermoanalytik und der lnfrarotspektroskopie. Der Gewichtsverlust, der auftritt, wenn die Temperatur mit konstanter Geschwindigkeit erhoht wird, laSt sich vier Elementarprozessen zuordnen: lnduktionsperiode, Sublimation, Festphasenreaktion 1....
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Journal title
volume 10 issue 4
pages 3- 10
publication date 2016-03
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