Preparation of reduced sensitivity co-crystals of cyclic nitramines using spray flash evaporation  

作　　者：Mrinal Ghosh AKSikder Shaibal Banerjee MBTalawar NSikder 

机构地区：[1]High Energy Materials Research Laboratory,Pune 411021,India [2]Defence Institute of Advanced Technology,Pune 411025,India

出　　处：《Defence Technology（防务技术）》2020年第1期188-200,共13页Defence Technology

基　　金：Defense Research&Development Organization(DRDO),India for financial support towards this study。

摘　　要：The present day weapon technology demands novel energetic materials that exhibit simultaneous high explosive yield and reduced sensitivity.This article demonstrates application of spray evaporation to prepare reduced sensitive co-crystals of high performance nitramine explosives like HMX and CL-20 with a relatively less insensitive explosive 1,1-diamino-2,2-dinitroethylene or FOX-7.Stronger intermolecurar hydrogen bonding in FOX-7 is responsible for limited solubility in nost of o rganic solvents.Large solubility differences of FOX-7 with HMX and CL-20 restricts ifs co-crystallization through classical methods that yields thermodynamically favorable product.Spray flash evaporation,a kinetic crystallization method,has been therefore adopted and could successfully produce CL-20/FOX-7(2:1) and HMX/FQX-7(4:1) co-crystals.The fine powdered materials obtained were characterized by SEM,powder XRD,Raman spectro scopy,DSC-TGA etc.Multipoint Raman spectra showed consistent occurrence of spectral features indicating stoichiometric co-existence of ingredients in the crystal lattices.DSC analysis showed absence of all thermally assisted solidsolid phase transformation in the co-crystals as they were observed in pristine materials.The thermal stability calculated in terms of activation barrier fordecomposition,revealed the CL-20/FOX-7 co-crystal to be interlediately stable on comparison to their constituents while,the HMX/FOX-7 co-crystal is more stable.Compared to pure HMX and CL-20,both the co-crystals have shown higher insensitivity to impact force,suggesting them to be suitable for future generation insensitive munitions.

关 键 词：CYCLIC NITRAMINE Solubility SPRAY evaporation Co-crystal REDUCED sensitivity 

分 类 号：TQ560.1[化学工程—炸药化工]