Green Preparation, Spheroidal, and Superior Property of Nano-1,3,5,7-Tetranittro-1,3,5,7-Tetrazocane

Jia, Xiaoqing; Wang, Jingyu; Hou, Conghua; Tan, Yingxin

doi:10.1155/2018/5839037

Cited by 12 publications

(6 citation statements)

References 19 publications

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“…[15] obtained different particle sizes of nano‐HMX (cyclotetramethylenetetranitramine) by sonochemically assisted solvent‐antisolvent spray technique and exhibited low spark sensitivity and outstanding heat‐release; Jia et all. [16] used a green process mechanical demulsification shearing (MDS) technology to prepare nano‐HMX with dense spherical, low impact sensitivity, low activation energy, and thermal decomposition temperature; Xing et all. [17] enhanced the safety performance of CL‐20 (hexanitrohexaazaisowurtzitane) by a siphon ultrasonic‐assisted spray refining technology to obtain submicron particle of CL‐20; besides, Huang et all.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 3D Porous Network Nanostructure of Nitrated Bacterial Cellulose Gel with Eminent Heat‐Release, Thermal Decomposition Behaviour and Mechanism

Ling

Cao²,

Gao³

et al. 2021

Propellants Explo Pyrotec

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In this study, a novel three‐dimensional (3D) porous cross‐link network structure of nitrated bacterial cellulose (NBC) nano‐gel, as an energetic gel matrix for fabrication of nanocomposite energetic materials, (nEMs) was synthesized by sol‐gel synthetic and the freeze‐drying technology. The analysis results revealed that the unique network structure with abundant of nano‐porous, which made the thermal behaviour of the NBC gel different from that of raw NBC. The thermal decomposition kinetic and mechanism of the NBC gel indicated that the exothermic peak temperature of the gel matrix decreased at low concentration, and the activation energy (Ea) of the gel0.5 (150000 J ⋅ mol−1) was much lower than that of raw NBC (223510 J ⋅ mol−1). However, the decomposition kinetic parameters of this study were not enough to illustrate the thermal properties, and which needs more effort to study them and complete. Furthermore, the initial reaction of gel decomposition was the splitting of urethane bond, and then the scission of −O−NO2 bonds happened, and the macromolecular chains’ breakage site of gel first occurred at −C−O−C− in the ring. After then, the chains of NBC break at −C−O−C− between the rings; notably, the heat‐release of gel was several times than that of raw NBC, which was liberated during the process of thermal decomposition. This promising research may provide potential application in preparing binder‐based nEMs and the basic theory of thermo‐analysis used in propellants and explosives.

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Section: Introductionmentioning

confidence: 99%

Synthesis of 3D Porous Network Nanostructure of Nitrated Bacterial Cellulose Gel with Eminent Heat‐Release, Thermal Decomposition Behaviour and Mechanism

Ling

Cao²,

Gao³

et al. 2021

Propellants Explo Pyrotec

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“…Satisfactorily, the emergence of nanoenergetic materials has attracted remarkable interests of many researchers at home and abroad, attributing to its larger specific surface, shorter transfer distance of heat and mass, and closer contact between solid particles in a mixture . Such as nano-RDX, , nano-HMX, , nano-CL-20, , and nano-NC are prepared and exhibit excellent sensitivities, including mechanical properties, thermal properties, and so on. Up till now, there have been many fabrication methods reported to prepare nanoenergetics, including sol–gel method, mechanical grinding method, freeze evaporation method, electrostatic spraying method, and physical vapor deposition method.…”

Section: Introductionmentioning

confidence: 99%

Safe Fabrication, Thermal Decomposition Kinetics, and Mechanism of Nanoenergetic Composite NBC/CL-20

Chen

Liu

2020

ACS Omega

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Benefiting from the sol−gel technology and vacuum freeze-drying technology, a novel nanoenergetic composite material nitrated bacterial cellulose (NBC)/CL-20 (hexanitrohexaazaisowurtzitane) has been fabricated. The thermal decomposition kinetic and mechanism have been studied by thermogravimetric analysis−differential scanning calorimetry (TG−DSC) under nonisothermal conditions in a nitrogen atmosphere at multiple heating rates; the process and mechanism of thermal decomposition of NBC/CL-20 1:1 have also been probed by TG−DSC−IR. The kinetic and thermodynamic parameters, such as activation energy (E a ), per-exponent factor (ln A K ), rate constant (k), activation heat (ΔH ⧧ ), activation free energy (ΔG ⧧ ), and activation entropy (ΔS ⧧ ) are calculated. The results indicate that NBC/CL-20 presents much lower activation energy than both of raw NBC and raw NC, and NBC/CL-20 1:1 exhibits superior thermal performance of heat release and E a . Moreover, there the existence mechanism has also been probed between NBC and CL-20 during the process of thermal decomposition. The structure and composition have been characterized by a series of characterization methods and indicate that CL-20 has been embedded homogenously in the NBC gel matrix with a prominent porous cross-linked network structure. The impact and friction sensitivities have also been decreased. The whole process effectively avoids high temperatures, and thus ensures operational safety.

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“…RDX was provided by Gansu Yinguang Chemical Industry Group Co, Baiyin, China. When preparing RDX/MUF composites by physical mixing and interfacial polymerization methods, the raw materials were recrystallized according to the reference [14]. Dimethyl sulfoxide was obtained from Tianjin Fuchen Chemical Reagent Factory, Tianjin, China.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Molecular Dynamics Simulation of RDX/MUF Nanocomposite Energetic Microspheres with Reduced Sensitivity

Jia

et al. 2019

Processes

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In order to improve the general problem of irregular coating morphology and low mechanical strength of the coating layer in existing coating desensitization technology, nano-cyclotrimethylene trinitramine/melamine-urea-formaldehyde (RDX/MUF) composite energetic microspheres were prepared by an improved emulsion polymerization, taking the MUF as the binder and RDX as the main explosive. In order to judge whether RDX/MUF possessed good stability, the combination of differential scanning calorimetry (DSC) and molecular dynamics (MD) simulation was used to determine the level of binding binding energy between urea-formaldehyde resin binder (UF) and RDX. In addition, to investigate the optimal reaction temperature for the preparation of MUF/RDX, the binding energy between UF and RDX at different temperatures was simulated. And then the morphology and thermal properties of the as-prepared composite energetic microspheres were analyzed by scanning electron microscopy (SEM) and DSC, the impact sensitivity and friction sensitivity of the resultant samples were tested as well. Moreover, RDX/MUF with the same MUF content was prepared by physical mixing for comparative analysis. MD simulation demonstrated that UF and RDX possessed good binding ability at 298 K. The DSC method indicatec that UF and RDX had good compatibility, and the comprehensive performance of RDX after coating was not significantly deteriorated; The optimal binding temperature between UF and RDX was 60~70 °C which is consistent with the experimental results. The experimental results showed that the optimum process conditions for the preparation of RDX/MUF could be listed as follows: the temperature for preparing RDX/MUF composite energetic microspheres by the improved emulsion polymerization was 70 °C the optimal pH value of the urea-formaldehyde resin prepolymer solution was 3, and the optimal melamine-urea molar ratio was 0.4.

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Green Preparation, Spheroidal, and Superior Property of Nano-1,3,5,7-Tetranittro-1,3,5,7-Tetrazocane

Cited by 12 publications

References 19 publications

Synthesis of 3D Porous Network Nanostructure of Nitrated Bacterial Cellulose Gel with Eminent Heat‐Release, Thermal Decomposition Behaviour and Mechanism

Synthesis of 3D Porous Network Nanostructure of Nitrated Bacterial Cellulose Gel with Eminent Heat‐Release, Thermal Decomposition Behaviour and Mechanism

Safe Fabrication, Thermal Decomposition Kinetics, and Mechanism of Nanoenergetic Composite NBC/CL-20

Preparation and Molecular Dynamics Simulation of RDX/MUF Nanocomposite Energetic Microspheres with Reduced Sensitivity

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