Thermal decomposition behavior, kinetics, and thermal hazard evaluation of CMDB propellant containing CL-20 by microcalorimetry

The thermochemical properties of 2,4-dinitroanisole (DNAN) in N-methy pyrrolidone (NMP) and dimethyl sulfoxide(DMSO) were studied using a RD496-2000 Calvet microcalorimeter at four different temperatures. The heat effects were measured for DNAN dissolved in NMP and DMSO and the relationships between the heat effects and the amounts of the substance were determined. The molar enthalpies and the differential molar enthalpies of dissolution processes were also obtained from the experimental data. The corresponding kinetic equations describing the two dissolution processes at different temperatures were discussed.

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“…(12) [20][21][22][23][24] are chosen as the model function describing the dissolution processes of DNAN in NMP and DMSO. …”

Section: The Kinetic Behaviorsmentioning

confidence: 99%

Thermochemical properties of 2,4-dinitroanisole in N-methyl pyrrolidone and dimethyl sulfoxide

Xiao

Luo

Zhao

et al. 2014

J Therm Anal Calorim

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“…HNIW is considered as the most powerful elementary explosive. It is predicted that HNIW would be a substitute for HMX, and equipped in various weapons very soon [6]. The thermal decomposition of HNIW has been investigated using molecular dynamics simulations [7][8][9] and different analytical instruments including thermogravimetry (TG), dynamic vacuum stability test (DVST), differential scanning calorimetry (DSC), mass spectrometry (MS), Fourier transform infrared spectroscopy (FTIR) and accelerating rate calorimetry (ARC) [3,5,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of thermal decomposition of ε-hexanitrohexaazaisowurtzitane by TG-DSC-MS-FTIR

Zhu

Shan

Xiao

et al. 2015

Korean J. Chem. Eng.

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Thermal decomposition of ε-hexanitrohexaazaisowurtzitane (HNIW) was studied by thermogravimetrydifferential scanning calorimetry-mass spectrometry-Fourier transform infrared spectroscopy (TG-DSC-MS-FTIR) simultaneous analysis. It has been shown that there is a crystal transition point for ε-HNIW, and only a single decomposition process has been observed for HNIW. The kinetic parameters of thermal decomposition of HNIW were obtained by Kissinger and Flynn-Wall-Ozawa methods, indicating that HNIW has the higher reactivity compared to the other nitramines. The HNIW decomposition mechanism demonstrated by the non-isothermal kinetics conformed to Avrami-Erofeev equation with the factor of nucleus growth of n=1/3 and the conversion degree of α from 0.1 to 0.7. The MS and FTIR analyses indicated that the thermal decomposition of HNIW favors N-N bond cleavage over C-N bond cleavage as the rate determining step.

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“…CL-20 is usually presented in different polymorphs, and among them ε-CL-20 is considered as the best form due to its highest performance and stability . It is the most promising candidate replacement of currently used high-energy nitramines such as hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) or octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) compounds …”

Section: Introductionmentioning

confidence: 99%

“…3 It is the most promising candidate replacement of currently used high-energy nitramines such as hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) or octahydro-1,3,5,7-tetranitro-1,3,5,7tetrazocine (HMX) compounds. 4 The thermal decomposition of CL-20 (micro, nano) has been widely investigated using theoretical techniques such as the molecule dynamic simulation 5,6 and various analytical stdies including differential scanning calorimetry coupled with thermogravimetry (DSC−TG), dynamic vacuum stability test (DVST), electroionization mass spectrometry (EI-MS), Fourier transform infrared spectroscopy (FT-IR), and accelerating rate calorimetry (ARC). 7,8 Also, the detailed chemical pathways of the effect of polymer on the decomposition pathways of ε-CL-20 under fast heating (300 K ps −1 ) have been modeled by the reactive molecular dynamics simulation (ReaxFF-lg).…”

Section: ■ Introductionmentioning

confidence: 99%

Preparation of CNTs Coated with Polydopamine–Ni Complexes and Their Catalytic Effects on the Decomposition of CL-20

et al. 2021

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To improve the condensed-phase reaction rate of ε-CL-20, polydopamine (PDA)−nickel complex-coated multiwalled carbon nanotubes (CNTs) have been prepared and used as combustion catalysts. The PDA−Ni complex has been prepared and in situ coprecipitated with ε-CL-20 by an antisolvent crystallization process in its dimethyl sulfoxide (DMSO) solution. It has been shown that crystalline CL-20 composites included with PDA−Ni complexes are polygon-shaped with a smooth surface and an average diameter of 10−15 μm, whereas it is 140 μm for raw ε-CL-20 crystals. The catalytic reactivity of the complex on thermolysis of CL-20 has been investigated using the differential scanning calorimetry (DSC) and thermogravimetry (TG)coupled Fourier transform infrared (FT-IR) spectroscopy technique. It has been found that CNT@PDA−Ni complexes have catalytic effects on the decomposition of ε-CL-20 by decreasing/shifting of the exothermic peak from T p = 240.1 to 238.7 °C. The FT-IR spectra of CL-20 decomposition products under the effect of the catalyst predominantly show peaks at 1274, 1644 and 1596, 1912, 2265, and 1956−1800 cm −1 , indicating the presence of fragments with N 2 O, NO 2 , NO, HNCO, and NO/CO, respectively. The change in the ε-CL-20 decomposition mechanism should be attributed to the catalytic action of CNT, decreasing the formation of NO 2 . Also, under the effect of the carbon-based catalyst, the HNCO formation was detected at another temperature in comparison with raw CL-20, with peak absorption at 224.1 vs 232.3 °C and the evolution was completed at 250.8 vs 246.2 °C, respectively.

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Thermal decomposition behavior, kinetics, and thermal hazard evaluation of CMDB propellant containing CL-20 by microcalorimetry

Cited by 29 publications

References 6 publications

Thermochemical properties of 2,4-dinitroanisole in N-methyl pyrrolidone and dimethyl sulfoxide

Thermochemical properties of 2,4-dinitroanisole in N-methyl pyrrolidone and dimethyl sulfoxide

Kinetics of thermal decomposition of ε-hexanitrohexaazaisowurtzitane by TG-DSC-MS-FTIR

Preparation of CNTs Coated with Polydopamine–Ni Complexes and Their Catalytic Effects on the Decomposition of CL-20

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