INVESTIGATION OF DIAMINODINITROETHYLENE (DADNE)

摘要

DADNE (FOX-7 or 1,1-diamine-2,2-dinitroethylene) is investigated by methods of differential-thermal (DTA) and thermo-gravimetric (TGA) analyses. Two exothermal peaks that, presumably, correspond to transitions between polymorphic modifications of this HE, are registered on DTA curve. Heat of low-temperature polymorphic transition (～+113 ℃) is estimated as ～ 25 J/g. Heat of high-temperature transition (～+158 ℃) is ～20J/g. Presence of two exothermic peaks (+207 ℃ and +277 ℃ under the heating rate of 2 ℃/min) on DTA of DADNE is confirmed. It is shown, that DADNE decomposes in two stages at heating over +210 ℃. The product of the first stage of decomposition of DADNE is new explosive (DADNE-T). The DTA, TGA, FTIR of DADNE-T are carried. The endothermic processes in DADNE-T in the temperature range +20 ℃ -400 ℃ are not founded. The beginning of exothermic decomposition of DADNE-T is recorded. By results of FTIR it is supposed that DADNE-T is the product of chemical transformation of two molecules of DADNE with participation of the part of ammo and nitro groups. The crystals of three types (tetrahedral prisms, crystals of the trimetric form and hexahedral prisms) are received at crystallization of DADNE from acetone, water and water-acetone mixes. Received crystals are investigated by methods of FTIR, DTA and TGA.