Abstract:Synthesis of 1-azido-2-(2’,4’,6’-trinitro phonyl) ethane,2,4.-bis( N-nitro )ethylamino-6-azido-1,3,5-triazine and tetraazido methylene methane, and the im proved preparation of 3-nitro-1,5-diazido-3-azapentane are discribed.Some properties of the four compounds are discussed as well.

Abstract:A new method is developed to preparate HMX by nitrolysis of DPT with nitrating agent HNO₃-P₂O₅-NH₄NO₃.The content of HMX in HMX/RDX mixture obtained from the nitrated products were determined by means of Hitachi 635 type HPLC.The results indicate that the yield of HMX by this method is approaching to that from nitration with acetic anhydride. This is a valuable progress in HMX synthesis without using acetic anthydride.

Abstract:Two methods for preparing crystallised dintroglycoluril （DINGU） via.recrystallization from nitric acid or nitration of glycoluril in mixed acid of HNO3-H2SO4 were investigated. Various factors affecting the DINGU crystal size, such as concentra tion of nitric acid, nitration coefficient of mixed acid, temperature and time of stabilizing treatment, and stirring etc, were discussed. The result of DINGU crystal preparation from DMSO was described as well.

Abstract:The effects of aluminum particle size on agglomeration situation orburning rate of aluminum powder were investigated.The experimental results and theoritical analysis indicate that the increase of aluminum particle size obviously decreases its agglomeration, but fine-grained aluminum improves its ignition and combustion characteristics.Due to the influence of aluminum particle size on thermal effect of the propellant burning surface, the burning rate decreases with the increase of aluminum particle size in low burning rate propellant,but the situation is opposite to that in high burning rate propellant.Therefore,reasonable use of aluminum particle size is very important to formulation design of solid propellants.

Abstract:The dispersion procedure of preparing nitrocellulose ball propellant containing combustion catalyst was described and effects of concentration of nitrocelloluse （NC）,dissolving time,volume ratio of water/solvent (RH₂O/RAC)and stirring rate onproperties of final products were investigated.The results show that the pseudodensity（ρb）and medium diameter(D₅₀) increase with the solution concentration and dissolving time of NC.The increase of RH₂O/RAC and stirring rate led to increase of ρb and decrease of D₅₀.

Abstract:Acoustic radiating method is used to determine the burning rate of the propellants which contain superfine Cu₂O（ 0. 2μm）, ordinary Cu₂O（ 3μm）,copper chromic oxide（YB ）,copper（Ⅱ）-containing organic complex（QC）or their different combinations under the pressure of 4～8MPa. From the experimental results, it can be seen that the superfine Cu₂O is significantly beneficial to the burning rate of RDX/AP/ HTPB propellant.2% of this Cu₂O can increase the burning rate by 77.1% , which is 5 times higher than that of ordinary Cu₂0.When combined with YB and QC which are two copper-containing catalysts, it can increase the burning rate by 120% and lower the pressure exponent by 50%, respectively.

Abstract:The experimental results of explosive impact sensitivity test and the relationship between explosion noise and sample weight is discussed.The sensitivity of some less sensitive and insensitive explosives are evaluated by means of their impact sound pressure level vs. sample weight curves.

Abstract:The structure and basic principle of transient spectroradiometer in deter mination of combustion behavior of pyrotechnics are briefly described.Some important parameters including radiant spectro-power distribution,chromaticity(dominant wavelength,colour temperature,colour-rendering index)and luminous intensity are measured for a series of pyrotechnics such as military black powder,green and yellow luminous compositions,tracers and incendiary compositions.

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