为探究含能共晶TKX-55的热解机制及溶剂组分二氧六环(1,4-Dioxane,DIO)对含能组分5,5′-双(2,4,6-三硝基苯基)-2,2′-双(1,3,4-噁二唑)(BTNPBO)热解的影响,基于反应力场(ReaxFF-lg,Reactive Force Field-Low Gradients)开展了TKX-55和...为探究含能共晶TKX-55的热解机制及溶剂组分二氧六环(1,4-Dioxane,DIO)对含能组分5,5′-双(2,4,6-三硝基苯基)-2,2′-双(1,3,4-噁二唑)(BTNPBO)热解的影响,基于反应力场(ReaxFF-lg,Reactive Force Field-Low Gradients)开展了TKX-55和纯溶剂组分DIO的分子动力学模拟研究。结果表明,TKX-55的初始分解反应包括了含能分子的二聚反应、含能组分和溶剂组分之间的氢转移、含能组分中1,3,4-噁二唑的开环反应以及硝基解离。二聚反应为后续团簇的快速生长提供了条件,团簇的大量生成限制了热量的释放和稳定小分子产物的释放,这是TKX-55高耐热性的本质原因。纯溶剂组分体系低温下放热量较小,且不易形成团簇,在较高温度下放热量以及团簇的体积和数量明显增加。DIO分子在TKX-55中的主要作用是吸附活性小分子产物(如OH、NO、NO_(2)等),间接抑制BTNPBO的分解进程。展开更多
The selected 18 energetic compounds were theoretically investigated by using the density functional theory（DFT） quantum mechanical code,DMol3,and the Hansen solubility parameters（HSPs） analyses.The results showed ...The selected 18 energetic compounds were theoretically investigated by using the density functional theory（DFT） quantum mechanical code,DMol3,and the Hansen solubility parameters（HSPs） analyses.The results showed that 4-nitrotoluene,4-nitrophenol,N N0-dimethyl-N N0-diphenylurea and N N0-diethyl-N N0-diphenylurea contain relatively electron-rich aromatic rings.Four satisfactory energetic precursors with electron-rich rings were quickly and effectively found by electrostatic potential（ESP）surfaces and HSPs analyses.The results also indicated that the absolute value of the lowest unoccupied molecular orbital（LUMO） of the energetic precursors with electron-rich rings often was less than3.00 eV,and the absolute value of LUMO of the energetic precursors with electron deficient rings was often more than 3.00 eV.Additionally,we found that with at least two eutectic points was a prerequisite for two precursors to form a cocrystal.展开更多
A typical nitroimine bistriazole（DNABT） was synthesized with high yield（90.4%） by nitration reaction from DABT in HNO3 and NH4NO3. Furthermore, a novel cocrystal（1） consisting of DNABT, H2O and DMSO in a 1：2：2...A typical nitroimine bistriazole（DNABT） was synthesized with high yield（90.4%） by nitration reaction from DABT in HNO3 and NH4NO3. Furthermore, a novel cocrystal（1） consisting of DNABT, H2O and DMSO in a 1：2：2 molar ratio was analysized on the crystal structure. Cocrystal 1 crystallizes in the triclinic system, space group P1 with a = 6.3124（18）, b = 8.233（2）, c = 9.775（3） A, β = 98.326（4）°, V = 481.59（74）A^3, Z = 2, Dc = 1.55 g/cm^3, F（000） = 234, μ = 0.337 mm^-1, S = 1.078, the final R = 0.0609 and w R = 0.2743. Additionally, the crystal structure is built up by four strong and seven weak hydrogen bonds. And the hydrogen bond network contributes to the stability of DNABT molecule. Typical TGA and DSC curves indicate the cocrystal 1 includes one endothermic and one exothermic decomposition processes, and the peak temperature at each process is 164.0 and 245.0 ℃. The nonisothermal decomposition kinetics analysis was performed by means of the Kissinger and Ozawa methods. The apparent activation energy（Ea） and pre-exponential factor（A） of the two decompositions are 96.0 kJ·mol^-1, 108.1 s^-1 and 215.8 kJ·mol^-1, 1018.9 s^-1, respectively.展开更多
文摘为探究含能共晶TKX-55的热解机制及溶剂组分二氧六环(1,4-Dioxane,DIO)对含能组分5,5′-双(2,4,6-三硝基苯基)-2,2′-双(1,3,4-噁二唑)(BTNPBO)热解的影响,基于反应力场(ReaxFF-lg,Reactive Force Field-Low Gradients)开展了TKX-55和纯溶剂组分DIO的分子动力学模拟研究。结果表明,TKX-55的初始分解反应包括了含能分子的二聚反应、含能组分和溶剂组分之间的氢转移、含能组分中1,3,4-噁二唑的开环反应以及硝基解离。二聚反应为后续团簇的快速生长提供了条件,团簇的大量生成限制了热量的释放和稳定小分子产物的释放,这是TKX-55高耐热性的本质原因。纯溶剂组分体系低温下放热量较小,且不易形成团簇,在较高温度下放热量以及团簇的体积和数量明显增加。DIO分子在TKX-55中的主要作用是吸附活性小分子产物(如OH、NO、NO_(2)等),间接抑制BTNPBO的分解进程。
基金financial support from National Natural Science Foundation of China–CAEP project (No. 11076002)Science and Technology Found of CAEP (No. 2012A0302013)
文摘The selected 18 energetic compounds were theoretically investigated by using the density functional theory（DFT） quantum mechanical code,DMol3,and the Hansen solubility parameters（HSPs） analyses.The results showed that 4-nitrotoluene,4-nitrophenol,N N0-dimethyl-N N0-diphenylurea and N N0-diethyl-N N0-diphenylurea contain relatively electron-rich aromatic rings.Four satisfactory energetic precursors with electron-rich rings were quickly and effectively found by electrostatic potential（ESP）surfaces and HSPs analyses.The results also indicated that the absolute value of the lowest unoccupied molecular orbital（LUMO） of the energetic precursors with electron-rich rings often was less than3.00 eV,and the absolute value of LUMO of the energetic precursors with electron deficient rings was often more than 3.00 eV.Additionally,we found that with at least two eutectic points was a prerequisite for two precursors to form a cocrystal.
文摘A typical nitroimine bistriazole（DNABT） was synthesized with high yield（90.4%） by nitration reaction from DABT in HNO3 and NH4NO3. Furthermore, a novel cocrystal（1） consisting of DNABT, H2O and DMSO in a 1：2：2 molar ratio was analysized on the crystal structure. Cocrystal 1 crystallizes in the triclinic system, space group P1 with a = 6.3124（18）, b = 8.233（2）, c = 9.775（3） A, β = 98.326（4）°, V = 481.59（74）A^3, Z = 2, Dc = 1.55 g/cm^3, F（000） = 234, μ = 0.337 mm^-1, S = 1.078, the final R = 0.0609 and w R = 0.2743. Additionally, the crystal structure is built up by four strong and seven weak hydrogen bonds. And the hydrogen bond network contributes to the stability of DNABT molecule. Typical TGA and DSC curves indicate the cocrystal 1 includes one endothermic and one exothermic decomposition processes, and the peak temperature at each process is 164.0 and 245.0 ℃. The nonisothermal decomposition kinetics analysis was performed by means of the Kissinger and Ozawa methods. The apparent activation energy（Ea） and pre-exponential factor（A） of the two decompositions are 96.0 kJ·mol^-1, 108.1 s^-1 and 215.8 kJ·mol^-1, 1018.9 s^-1, respectively.
