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Yang Q.,Southwest University of Science and Technology | Peng B.-H.,Southwest University of Science and Technology | Liang G.,Luzhou North Chemical Industries Co. | Luo Q.-P.,Southwest University of Science and Technology | Pei C.-H.,Southwest University of Science and Technology
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2012

Nitrated bacterial cellulose (NBC) was synthesized from bacterial cellulose (BC) by nitric-sulfuric acid method. The results showed that the network structure of BC were not obviously degraded by this method and the stability of nitrated bacterial cellulose reached the standard for A degree of nitrocellulose. The thermal decomposition activation energy calculated by differential scanning calorimetry results is 212.53 kJ/mol, and the thermal stability of nitrated bacterial cellulose is better than nitrocellulose.


Xu W.,North University of China | An C.,North University of China | Wang J.,North University of China | Dong J.,Luzhou North Chemical Industries Co. | Geng X.,Binzhou University
Propellants, Explosives, Pyrotechnics | Year: 2013

A new insensitive booster explosive based on 2,6-diamino-3,5- dinitropyrazing-1-oxide (LLM-105) was prepared by a solvent-slurry process with ethylene propylene diene monomer (EPDM) as binder. SEM (scanning electron microscopy) was employed to characterize the morphology and particle size of LLM-105 and molding powder. The mechanical sensitivity, thermal sensitivity, shock wave sensitivity, and detonation velocity of the LLM-105/EPDM booster were also measured and analyzed. The results show that both mechanical sensitivity and thermal sensitivity of LLM-105/EPDM are much lower than that of conventional boosters, such as PBXN-5 and A5. Its shock wave sensitivity is also lower than that of PBXN-5 and PBXN-7. When the density of charge is 95 % TMD, its theoretical and measured detonation velocities are 7858 m s-1 and 7640 m s-1, respectively. These combined properties suggested that LLM-105/EPDM can be used as an insensitive booster. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhu L.,Luzhou North Chemical Industries Company Ltd | Wu Y.,Assembly Military Representative Office in the Luzhou Area | Dong J.,Luzhou North Chemical Industries Company Ltd | Mao C.-Y.,Assembly Military Representative Office in the Luzhou Area | You D.,Luzhou North Chemical Industries Company Ltd
Binggong Xuebao/Acta Armamentarii | Year: 2012

Variable burning rate propellant is composed of layers of propellants which has the different burning rates. In order to explain the progressive combustibility of variable burning rate propellant, the three double-layer variable burning rate propellant samples were prepared, which had different inner to-outer layer thickness ratios. The shape feature amount and shape function were calculated. The graphic results of σ-Z and ω-Z show that, with the decrease in the thickness of combustion layer, the combustion area is gradually increased, and the growth rate of gas volume increases. Compared with the classic 5/7 propellant, the variable burning rate propellant has a more significant increase in growth surface, and a stronger progressive combustibility. p-t values of the samples were measured by closed bomb test, and Γ-Ψ curve was drawn. The results show the conditions of the progressive combustibility of samples with different inner-to-outer layer thickness ratios. The result from the closed bomb test result is consistent with the theoretical analysis.


Dong J.,Luzhou North Chemical Industries Company Ltd | Gu Q.,Luzhou North Chemical Industries Company Ltd | Zhu L.,Luzhou North Chemical Industries Company Ltd | Wang Y.-J.,Luzhou North Chemical Industries Company Ltd | Liao T.-C.,Luzhou North Chemical Industries Company Ltd
Binggong Xuebao/Acta Armamentarii | Year: 2012

The thermal behavior, mechanism and kinetic parameters of the exothermic decomposition reaction of glycidyl azide polymer (GAP) at the heating rates of 2,5,10 and 20°C/min were investigated by the mean of TG-DSC. On this basis, the critical temperature of thermal explosion and 500 d cook-off temperature of CAP were also calculated and studied. The results show that the exothermic decomposition of GAP has two stages. The first stage belongs to the first order exothermic decomposition reaction, and the apparent activation energy Ea is 214.34 kJ/mol, the pre-exponential factor A is 1021.48, the kinetic model function in differential form f(α) is 0.5/α, and the thermal decomposition kinetic equation is dα/dt=1.51×1021α-1exp (-2.58×104/R). And in the second stage, Ea is 47.98 kJ/mol-1, A is 103.62, f(α)=1.5(1-α)4/3 [(1-α)-1/3-1]-1, dα/dt=6.25×103(1-α)4/3 [(1-α)-1/3-1]-1 exp(-5.57×103/R). The values of ΔS≠, ΔH≠and ΔG≠ of the reaction at 221.25°C are 158.65 J/(mol·K), 212.66 kJ/mol, 134.23 kJ/mol, respectively. The critical temperature of thermal explosion and 500 d cookoff temperature for this energetic bind are 231.16°C and 95.37°C, respectively.


Chen M.,Nanjing University of Science and Technology | Xiao Z.,Nanjing University of Science and Technology | Zhang Y.,Xi'an Modern Chemistry Research Institute | Dong C.,Luzhou North Chemical Industries Co.
Proceedings - 29th International Symposium on Ballistics, BALLISTICS 2016 | Year: 2016

An on-line auto mass measurement approach was applied to study the volatilization of the residual solvents during the drying process of the single-based propellant, double-based propellant containing triethyleneglycol dinitrate (TEGDN propellant, denoted as TEGDN-1) and TEGDN propellant containing RDX (denoted as TEGD N-2). Their drying rate curves were obtained by the on-line auto mass meas urement approach. The mechanical properties of the three kinds of propellants were influenced by different residual solvent contents. The propellant strands are sufficiently plastic and elastic to be cut without being deformed when they are dried to a certain residual solvent contents.


Chen M.,Nanjing University of Science and Technology | Zhang Y.,Xi'an Modern Chemistry Research Institute | Dong C.,Luzhou North Chemical Industries Co. | Xiao Z.,Nanjing University of Science and Technology
Propellants, Explosives, Pyrotechnics | Year: 2016

An on-line auto mass measurement approach was applied to study the volatilization of residual solvents during the drying process of a single-based propellant, a double-based propellant containing triethyleneglycol dinitrate (TEGDN propellant, denoted as TEGDN-1) and a TEGDN propellant containing RDX (denoted as TEGDN-2). Drying experiments were conducted at a temperature of 50°C, steady humidity, and atmospheric pressure. According to the drying rate curves obtained by the on-line auto mass measurement approach, it took 44h, 31h and 38h, respectively, for the residual solvent contents of the three kinds of propellants to come to an equilibrium point, which is approximately below 1%. The mechanical properties of propellant strands with different residual solvent contents were tested by a universal testing machine and dynamic thermomechanical analysis (DMA). The results indicate that the mechanical properties of the single-based propellant, TEGDN-1 and TEGDN-2 are influenced by the residual solvent content. The propellant strands are sufficiently plastic and elastic to be cut without being deformed at a broad range of temperature when they are dried to residual solvent contents of 5.8-3.6%, 9-5.7%, and 9.7-6.2%, respectively. In the drying experiment, the on-line auto measurement approach of the residual solvent mass of propellant strands is a highly promising method in view of its improvement in the cutting efficiency of propellant strands. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhu L.,Luzhou North Chemical Industries Co. | Ou J.-Y.,Luzhou North Chemical Industries Co. | Yang X.-Y.,Luzhou North Chemical Industries Co. | Wang Y.-J.,Luzhou North Chemical Industries Co.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2012

Al powder, RDX and catalysts was coated by nitrocellulose and formed composite spherical green powder. The modified double-based propellant product was produced by the composite spherical green powder. The effects of the composite spherical green powder on mechanical and combustion properties of formed propellant were studied. Results show that their mechanical properties are much better than that of double-based spherical green powder made propellant. Their low temperature elongation at break from is increased from 7.84% to 26.86%, the max ensile strength at high temperature is close to double increase, and the temperature pressure index is decreased from 0.38 to 0.30.


He X.-J.,University of Sichuan | He X.-J.,Luzhou North Chemical Industries Co. | Xu X.,Luzhou North Chemical Industries Co. | Du L.-P.,Luzhou North Chemical Industries Co. | And 2 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2011

In order to improve mechanical property of nitroamine propellant containing a large amount of high-energy solid filler, a certain amount of thermoplastic elastomer (TPE) was added. Through low-temperature drop weight test, charpy impact test for impact-resistance measuring and the closed-bomb test, the mechanical property and static combustion performance of nitroamine propellant containing the thermoplastic elastomer were studied. Results show that thermoplastic elastomer is able to effectively improve low-temperature tenacity and impact-resistance strength of the nitroamine propellant, and burning rate of the nitroamine propellant can be decreased by about 10%, burning rate pressure exponent of the nitroamine propellant can be reduced by about 2%.


Dong J.,Luzhou North Chemical Industries Co. | Ou J.-Y.,Luzhou North Chemical Industries Co. | Zhu L.,Luzhou North Chemical Industries Co. | Li B.,Luzhou North Chemical Industries Co.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2016

To understand the thermal decomposition kinetics and thermal safety property of azido-terminated glycidyl azide polymer (GAPA), its thermal decomposition characteristics was investigated through differential scanning calorimetry(DSC) and thermal gravimetry(TG). The apparent activation energy, pre-exponential factor and thermal decomposition kinetic equation were studied based on the DSC curve peak temperatures and the TG curve decomposition degrees at heating rates of 2 ℃·min-1, 5 ℃·min-1, 10 ℃·min-1 and 20 ℃·min-1. Its kinetic parameters thermodynamic and thermal safety parameters were calculated. The study indicates that there are two stages in the GAPA thermal decomposition reaction with the apparent activation energy EK=218.47 kJ·mol-1, pre-exponential factor AK=1.06×1022s-1, self-ignition temperature Tbpo=506.55 K, self-accelerated decomposition temperature TSADT=496.78 K, free energy of activation ΔG≠=132.76 kJ·mol-1, enthalpy of activation ΔH≠=214.34 kJ·mol-1 and entropy of activation ΔS≠=164.21 J·mol-1·K-1. © 2016, Editorial Board of Chinese Chinese Journal of Energetic Materials. All right reserved.

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