1,1-Diamino-2,2-dinitroethylene (DADNE, FOX-7) is a new promising insensitive high energetic material. The final performance of this material is similar with common high energetic materials such as RDX and HMX. However, DADNE shows the lower sensitivity to impact and friction than those materials. The final applications, which are solid loading, ballistics, shelf-life, and compatibility, and sensitivity of high energetic materials depend on the crystal properties such as morphology, size, size distribution, solvent inclusion, and polymorph. The synthesized DADNE crystals had needle-like morphologies and the mean particle size of 50μm. In order to control the properties, seed crystals were initially generated by changing the solvent composition adding water as an anti-solvent to DADNE/dimethylacetamide (DMAc) solution, and those crystals were slowly grown by cooling of the solution. The important factor of this research which influenced the crystal properties was a feeding method of the anti-solvent into the solution. Depending of the manner of feeding anti-solvent, the crystals with the desired properties could be obtained. The morphologies of the final products were polygonal and the mean sizes were 35 and 145μm, respectively. In addition, the impact sensitivities of the products were 26 and > 35 J depending on the mean size, respectively.
DADNE, crystallization, morphology, size, sensitivity