(C6N2H14) NH4 (ClO4)3 (DAP-4) have attracted an increasing focus recently as an ammoniumperchlorate-based molecular perovskite energetic material with outstanding features. Microscopy, variable temperature X-ray diffraction, in situ infrared spectroscopy, differential scanning calorimetry-thermogravimetry simultaneous thermal analysis coupled with infrared spectroscopy and mass spectrometry (DSC-TG/FTIR/MS) techniques were used to systematically investigate DAP-4 thermal properties from -40 degrees C to 550 degrees C. The results revealed that DAP4 have two solid-solid crystallization phase transitions with a non-characteristic melting process. The generated activation energies of HCN, CO, CH2NH2, CO2 and NO2 gas products are all lower than the macroscopic decomposition's of DAP-4. This finding strongly proves that DAP-4 is easy to form these gas products during thermal stimulus. The two stages decomposition mechanism accompanying a large of CH2NH2 and NH2C2H4 gases and kinetic model of DAP-4 were proposed under the condition of high-purity argon gas. This study provides new insight into the in-depth and accurate description thermal decomposition mechanism of DAP-4 as a potential energetic material.

(C6N2H14) NH4 (ClO4)3 (DAP-4) have attracted an increasing focus recently as an ammoniumperchlorate-based molecular perovskite energetic material with outstanding features. Microscopy, variable temperature X-ray diffraction, in situ infrared spectroscopy, differential scanning calorimetry-thermogravimetry simultaneous thermal analysis coupled with infrared spectroscopy and mass spectrometry (DSC-TG/FTIR/MS) techniques were used to systematically investigate DAP-4 thermal properties from -40 °C to 550 °C. The results revealed that DAP-4 have two solid-solid crystallization phase transitions with a non-characteristic melting process. The generated activation energies of HCN, CO, CH2NH2, CO2 and NO2 gas products are all lower than the macroscopic decomposition's of DAP-4. This finding strongly proves that DAP-4 is easy to form these gas products during thermal stimulus. The two stages decomposition mechanism accompanying a large of CH2NH2 and NH2C2H4 gases and kinetic model of DAP-4 were proposed under the condition of high-purity argon gas. This study provides new insight into the in-depth and accurate description thermal decomposition mechanism of DAP-4 as a potential energetic material.

为了快速检测 HMX的晶型纯度,采用X射线粉末衍射(XRD)技术结合化学计量学偏最小二乘法,建立了 HMX晶型纯度定量计算模型及晶型纯度检测方法,并讨论了建模样品的设计及模型的优化过程.结果表明:模型交互验证相关系数(R2)为0.975 3,交互验证均方根误差(RMSECV)为0.916％,外部验证均方根误差(RMSEP)为0.552％,该模型具有较高的预测精度和准确度.研究表明该方法可用于HMX产品的晶型纯度测定.

The nitrogen content in nitrocellulose was determined by using the Vario MACRO cube element analyzer. The design of two stage combustion tubes made with stainless steel assures the complete combustion of nitrocellulose under large sample amounts and the safety of combustion. The maximum sample amount can reach 85 mg. The method possesses the advantages such as simplicity, rapidity, high degree of automation, high accuracy of results, and so on.

This paper reviews on the applications of Raman spectroscopy in the identification of explosive.The characteristics of the Raman spectrum used in explosive identification are explained and the technology applied in explosive structure characterization,remote probing and identification of trace explosive residues is analyzed.We put forward the prospects of Raman spectroscopy in the fields of rapid detection,trace detection,quantitative detection and remote detection aiming at the urgent demands of national defense,security inspection,criminal investigation and emergency incidents.

A new dynamic calibration method as prediction-calibration-approximation used for calibration of propellants and explosives gas test by automatic gas combination system and calibration device was reported in this paper.The results indicate that the accurate measurement of multicomponent gas was achieved by dynamic calibration technology of multicomponent propellants and explosives gas.The relative standard deviation of Dynamic Calibration is less than 0.3%.As a result,the dynamic calibration technology ensures validity and unity of measuring value transfer in gas detecting.

In order to evaluate the activation of aluminium powder in aluminized explosives,the activity of aluminium powder in military FLX and FLU series was measured by X-ray fluorescence(XRF) spectrometry and X-ray diffraction(XRD) spectrometry.The results show that only XRF method can be used to analyze activity of aluminium powder.A correction factor of aluminium activity is obtained by fitting results of XRF method and standardization method(chemical analysis method) GJB1738-1993.The relative deviation obtained by XRF method and chemical analysis method for detecting activity of aluminium powder in A-Ⅸ-Ⅱ explosives is less than 4%.

针对刑侦过程中采集的疑似爆炸物物证的鉴定,介绍了运用化学分离及红外光谱、X射线荧光光谱、扫描电镜与能谱联用等光谱分析技术,对工业硝铵炸药、黑火药、雷管等不同种类常见爆炸物的快速技术鉴定程序,总结了光谱分析技术在未知爆炸物鉴定中的应用.结果表明光谱分析技术具有较爆炸试验更方便、快速、所需样品少且更加安全等优点,可快捷、准确地对未知及疑似爆炸物进行检验、判定.

GPC coupled with multi angle laser light scattering was used to determine molecular weight and distribution of PAMMO.The light scattering principle and procedure was introduced.At the same time some key experimental factors such as dn/dc,concentration,and flow rate were discussed.It is found that when dn/dc is 0.0929,the concentration is 20~60 mg/mL,the flow-rate is 1 mL/min and under the condition that the selection of effective peak area is the occurrence of the differential peak versus the disappearance of laser peak,satisfactory results were obtained.

The gas-products of Olympic kindling spark were studied in simulation test module,with strong wind and low pressure which like natural environment of Jolmo Lungma.The cause and kinds of bad smell were analyzed.The difference of gas concentration between inside and outside carrying-box was compared.The safety distance between carring personnel and outlet was calculated.The results show that the bad smell gas is caused by a smell guantities of organic volatilizable gas,HCl and H2S produced under the conditions of low pressure and environment of lacking oxygen.The burning kindling spark is safe for carrying personnel.

A new method for determination of tin and lead content in TDI-reduction catalyzer by XRF was developed and evaluated.We prepared for standard sample,made the choice of peak on different working conditions,and the method of deducting background.It is concluded that XRF could determine SnO2 and Pb content simultaneously while the sample was scatheless.Under the best working condition,10 times determination was done,The result is that the relative standard deviations of Pb is 0.37%,and SnO2 is 0.61%.

Combining closed bomb with the self-designed device for collecting and measuring gas-fired,the main components of gas-fired(oxygen,carbon monoxide and nitric oxide) were tested quantitatively.The sensor was calibrated by standard gas-mixture device and first-order standard gas,and RSD≤2.5%.The satisfactory results are obtained from applying the method to the certain propellant formulation(shuangfang-3,ETPE,and ZXR etc.).