LI Yu-fang , LIAO Xin , JU Xue-hai , YI Jian-hua , XU Si-yu
2010, 18(3):241-246. DOI: 10.3969/j.issn.1006-9941.2010.03.001
Abstract:The tautomerizations of polyazido-azine(ring-closure reaction) for 3,6-diazido-1,2,4,5-tetrazine(DiAT) and 2,4,6-triazido-1,3,5-triazine(TAT) were investigated by density functional theory. All of the stationary points(reactants,transition states and products) on the reaction paths were optimized at the B3LYP/6-311G** level. The total energies were obtained after zero-point vibrational energy correction. Enthalpies of formation were derived via the designed isodesmic reactions. The changes of energies,geometries and enthalpies of formation in the tautomerization were analyzed. The cyclization of 3,6-diazido-1,2,4,5-tetrazine processes by two steps with energy barriers of 100.5 and 117.4 kJ·mol-1,respectively,and the cyclization of 2,4,6-triazido-1,3,5-triazine by three steps with energy barriers of 101.8,99.7 and 108.7 kJ·mol-1. The enthalpies of formation increase in the process of cyclizations. The ring-closure reaction of TAT is thermodynamically more unfavorable in comparison to that of DiAT. The solvent effect of dimethyl sulfoxide on the tautomerization was evaluated with the self-consistent reaction field (SCRF) method.
XIONG Ying , SHU Yuan-jie , YIN Ming , LONG Xin-ping , ZUO Yu-fen , WANG Xin-feng
2010, 18(3):247-251. DOI: 10.3969/j.issn.1006-9941.2010.03.002
Abstract:The structure,enthalpy of formation,density and thermal decompostion mechanism of N-methyl-N'-methoxydiazene-N-oxide(MMDO) were studied based on density fuctional theory,and compared with its nitramino-isomer dimethylnitramine(DMNA). Results show that Z-conformation of MMDO is more stable than that of E-conformation,and Z-conformation of MMDO is the main existence form. The energy barriers of isomerizations between Z and E forms are higher than that of thermal decomposition,accordingly the isomerizations do not occur in the conditions of thermal decomposition. The enthalpy of formation (42.50 kJ·mol-1) and thermal stablily of Z-MMDO are higher than that of its nitramino-isomer DMNA(-12.74 kJ·mol-1). However the density(1.331 g·cm-3) of Z-MMDO is slightly lower than that of DMNA(1.363 g·cm-3). CH3O—N and CH3—O dissociations are two competitive thermal decomposition ways of MMDO.
YI Jian-hong , HU Shuang-qi , LIU Sheng-nan , CAO Duan-lin , REN Jun
2010, 18(3):252-256. DOI: 10.3969/j.issn.1006-9941.2010.03.003
Abstract:Twenty-four nitropyzarole compounds and their derivatives were investigated by density functional theory. Their optimized geometries and electronic structures were calculated at the B3LYP/6-311G(d,p) level. Optimized geometries of these compounds show that they have no imaginary frequencies,and they are stable on the potential energy surface. The heat capacity and enthalpy of some typical compounds at different temperatures were obtained by statistic thermodynamics,and isodesmic reactions were designed for calculating standard enthalpies of formation for the derivatives of nitropyzarole. The average molar volume and theoretical density were estimated using the Monte-Carlo method based on 0.001 e·bohr-3 densigy space. Furthermore,the detonation velocity and pressure of the derivatives were estimated by the Kamlet-Jacbos equation. Results show that the ring of pyrazole has some aromaticity and the detonation velocities of these compounds are between 6.42 and 9.00 km·s-1. Detonation performances of these compounds show that they are very good candidates for energetic materials.
LI Chun-ying , DU Yong-mei , Lü Jian
2010, 18(3):257-260. DOI: 10.3969/j.issn.1006-9941.2010.03.004
Abstract:Synthesis of exo-tetrahydrodicyclopentadiene (exo-THDCPD) in ionic liquids was studied. Ionic liquids were prepared by aluminum chloride and dialkylimidazolium halide or alkylpyridinium halide and were used in isomerization of endo-tetrahydrodicyclopentadiene (endo-THDCPD) as catalyst and solvent. Effects of reaction conditions such as reaction temperature,reaction time,and ionic liquid amount on the conversion of endo-THDCPD and yield of exo-THDCPD were studied. Results show that the conversion of endo-THDCPD is 100% in different ionic liquids. The yield of exo-THDCPD is 98.3% in 1,3-dialkylimidazolium chloride/aluminum chloride (n(AlCl3)n( Cl=1.5) at 50 ℃ for 3 h. The yield of exo-THDCPD is 97.8% in 1-butylpyridinium chloride/aluminum chloride (n(AlCl3)n( Cl=1.8) at 50 ℃ for 3 h. The product can be simply separated and ionic liquids can be reused at least five times without decreasing of the catalytic activity.
LU Xian-ming , GAN Ning , XING Ying , HAN Tao , LIU Qing , ZHANG Zhi-gang , LI Lei
2010, 18(3):261-265. DOI: 10.3969/j.issn.1006-9941.2010.03.005
Abstract:Using water and toluene as solvents,and quaternary ammonium salt as phase transfer catalyst,under the effect of NaOH,3,3-dibromomethyl oxetane (BBMO) was synthesized by the cylization of 1,1,1-tribromomethyl-1-hydroxymethyl methane. Using water as solvent,quaternary ammonium salt as phase transfer catalyst,3,3-diazido methyloxetane (BAMO) was obtained by the substitutation of BBMO with NaN3. The prepolymer of BAMO (PBAMO) was synthesized by the cationic polymerization of the monomer BAMO,and it had a number average molecular weight from 3000 to 4000. The chain-extended PBAMO (CE-PBAMO) was synthesized by the chain extended of the PBAMO with 2,4-toluene diisocyanate (2,4-TDI) and 1,4-butanediol (1,4-BDO). The structure and physical chemical properties of BBMO,BAMO,PBAMO and CE-PBAMO were identified by FTIR,1H NMR,HPLC,DSC and GPC. The results show that the yield and purity of BBMO are 81% and 97.2%,and the yield and purity of BAMO are 80.9% and 98.37%; the synthesis of BBMO and BAMO by phase transfer catalysis possesses advantages of safety,high yield and high purity; the synthesized CE-PBAMO which has a number average molecular weight of 38933,can melt and dissolve,and its tensile strength is 12.7 MPa at 20 ℃,it can be used as high energy thermoplastic binder in the manufacture of the new type of combustible cartridge case which has concept of 3R(recycle,recover,reuse).
ZHANG Gong-zheng , LI Hai-hua , GUO Ling-hong
2010, 18(3):266-269. DOI: 10.3969/j.issn.1006-9941.2010.03.006
Abstract:3,3-Dinitrobutyl acrylate was prepared from 3,3-dinitro-1-butanol and acrylic acid through direct esterification,which was obtained by the reaction of the oxidative-nitration,Michael addition,hydrolyzation,decarboxylative-bromating,nucleophilic addition and alcoholysis using nitroethane as starting materials. The energetic binder poly(3,3-dinitrobutyl acrylate) was synthesized by the free radical polymerization of 3,3-dinitrobutyl acrylate in ethyl acetate by using azobisiosbutyronitrile as initiator. The structures and properties of poly(3,3-dinitrobutyl acrylate) were also characterized by FTIR,1H NMR,XRD,TG-DTA and DSC. Results show that poly(3,3-dinitrobutyl acrylate) is amorphous,and its glass state temperature is 38 ℃,and its mass loss is 22% at 250 ℃.
YANG Wei , JI Yue-ping , WANG Wei , CHEN Bin , WANG Ying-lei
2010, 18(3):270-272. DOI: 10.3969/j.issn.1006-9941.2010.03.007
Abstract:Using 2,4-dinitroimidazole(2,4-DNI) and organic amines as starting materials,four new salts,i.e.ADNI (A=guanidine,triaminoguanidine,gunanyl urea,and hydrazine ),were synthezised with yield of 87.2%,67.5%,67.7% and 96.6% respectively. The resulting salts structures were identified with FTIR,NMR and elemental analysis. The authors measured density,melting point,thermal stability,combustion heat,impact and friction sensitivity,and calculated formation enthalpy,detonation velocity and detonation pressure for all the salts(not including hydrazine). They exhibit relatively higher energy level,lower sensitivity,and better thermal stability. Among them,TAGDNI may be promising in applications to propellants with low signals,as a substitute for partial ammonium perchlorate(AP). Results show that TAGDNI has higher enthalpy of formation (623.36 kJ·mol-1),detonation velocity (8948.68 m·s-1),and detonation pressure (34.57 GPa),and its characteristic height (H50) is 125 cm (2 kg hammer).
WEI Wen-xian , JIANG Xiao-hong , LU Lu-de
2010, 18(3):273-277. DOI: 10.3969/j.issn.1006-9941.2010.03.008
Abstract:Nickel oxalate dihydrate (NiC2O4·2H2O) was prepared by coprecipitation method using nickel nitrate and oxalic acid as the raw materials. The product was characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),laser granularity measurement device,elemental analysis,Fourier transform infrared (FT-IR) spectrometry and TG-DTG analysis. Its catalytic effect on the thermal decomposition of TEGDN/NC propellant was studied via thermogravimetry-mass (TG-MS) coupling technique. The results show that the product contains crystal water,and its molecular formula is NiC2O4·2H2O. The product has good dispersion and its average particle size is 15.97 μm. NiC2O4·2H2O loses crystal water at the range of 180-250 ℃ and then decomposes at higher temperature. TG-MS analysis shows that adding 2% NiC2O4·2H2O can accelerate the thermal decomposition of TEGDN/NC propellant and accelerate the generation of gaseous products. The integral intensities of ion currents were calculated,and it is found that the generation amount of HCHO is obviously increased during the thermal decomposition process.
WEN Li-qun , ZHANG Tong-lai , QIN Qing-feng
2010, 18(3):278-281. DOI: 10.3969/j.issn.1006-9941.2010.03.009
Abstract:The UV-Vis absorbance data of TNT/acetone,TNT/toluene and TNT/acetonitrile with different concentrations were measured. Acetonitrile was used as recrystallizing solvent,and the solubility of TNT in supercritical carbon dioxide(SC-CO2) was tested at 303,308,313,318, 323 K and at pressure range of 10-25 MPa. The relationship of concentration and absorbance of TNT/acetonitrile solution at 248 nm wavelength was established. The results show that the solubility of TNT in SC-CO2 decreases with increasing of the temperature at the pressure (less than 15 MPa). However,it will increases with increasing of the temperature at high pressure (more than15 MPa). TNT has a high solubility in SC-CO2 and its value can get up to 14 mg TNT per gram of CO2.
DAI Xiao-gan , HUANG Yi-min , Lü Zi-jian , SHEN Chun-ying
2010, 18(3):282-285. DOI: 10.3969/j.issn.1006-9941.2010.03.010
Abstract:Cook-off tests for PBX-2 explosive with different heating rates of 3,5,10,25,105 ℃·min-1 were carried out. Temperature changing processes in sample radius and sample center were recorded by thermocouples,and the reaction degree of PBX-2 explosive was gained by blast pressure gauges. Reaction behavior for PBX-2 explosive was analyzed macroscopically under heat effect. The results of the tests initially show that the reaction degree for PBX-2 explosive is reduced with high heating rate in cook-off test. Numerical simulation was made for PBX-2 explosive by Arrhenius method. Calculated temperature is accord with experimental result.
CUI Kai-hua , HONG Tao , CAO Jie-dong
2010, 18(3):286-289. DOI: 10.3969/j.issn.1006-9941.2010.03.011
Abstract:Based on the experiments of cylindrical flat nosed copper projectiles impacting Comp B with various thickness steel cover plates,the explosion processes of cylindrical flat and round nosed tungsten projectiles impacting Comp B with various thickness steel cover plates were simulated. The curves of critical velocity vs thickness of the steel cover plate were quantitatively analyzed. The results show that the calculational results of direct shock initiation satisfy Jacobs criterion to a larger extent. Furthermore,the relationship between flat and round nosed tungsten projectiles velocities were obtained,i.e. Vround ≈1.15Vflat. At last,the reason of the delayed detonation(XDT) events was analysed. The cause was attributed to the mutual effects between the damage of Comp B and the reflection shock.
LI Jun-qiang , LI Xiao-jiang , LIU Peng , QI Xiao-fei , LIU Fang-li
2010, 18(3):290-294. DOI: 10.3969/j.issn.1006-9941.2010.03.012
Abstract:Four traditional eliminated-flame additives(LiF,KA,C4O6H4K2 and KD) were adopted in grain cast propellant,and its effects on the combustion performance and characteristic signal of the propellant were studied. The motor experiment results show that KA and KD suppress after burning. More than 80% flame area were reduced. Burning rate of propellant is increased with the eliminated-flame additives. Results show IR and visible light permeation rate of grain cast propellant is slightly reduced,and laser permeation rate is increased.
LIN Zhen-kun , HAN Dong-lin , WANG Tian-fang , ZHAO Feng-qi , YI Jian-hua , LI Shu-fen
2010, 18(3):295-299. DOI: 10.3969/j.issn.1006-9941.2010.03.013
Abstract:Effects of the oxidant (HMX or CL-20) on the combustion performances of Al/H2O based fuels were studied by a series of experimental techniques in air atmosphere. The experimental results show that,compared with CL-20 addition,HMX makes Al powders burn much thoroughly,and it has better effect in increasing the temperature of burning surface. However,CL-20 addition makes the heat transfer faster than HMX and improves the burning rate markedly. The experimental results are considered to be closely related to the thermal decomposition and combustion characteristics of CL-20 and HMX.
2010, 18(3):300-303. DOI: 10.3969/j.issn.1006-9941.2010.03.014
Abstract:The combustion behavior of composite fuel-rich propellants based on hydroxy-terminated polybutadiene pre-polymer (HTPB)/ammonium perchlorate oxidizer (AP) studied experimentally at 0.1-1 MPa. Results show that high content and small particle size of AP, high pressure promotes sustained combustion and increases burning rate, combustion efficiency and decreases ignition temperature. The copper chromite (CC) as a burning rate accelerator, moderately, increases the burning rate over the whole pressure regime. Moreover, it creates an acceptable combustion efficiency of about 96%. 6% CC decreases ignition temperature by about 16%. It is indicated that the Vieille burning rate law for this propellant family may be extended to extremely low pressures and combustion efficiency marked from "highly poor" to "poor" for the formulations without copper chromite.
PANG Wei-qiang , FAN Xue-zhong
2010, 18(3):304-308. DOI: 10.3969/j.issn.1006-9941.2010.03.015
Abstract:After the agglomerated boron particles were sieved,the loose and the tap bulk densities for different sizes of agglomerated boron particles were determined,and the microstructures of agglomerated boron particles were obtained by scanning electrical microscope. Results show that the diameter of boron particles and the loose and tap bulk density increase after agglomerated for amorphous boron powder,and both of the loose bulk density and tap bulk density decrease firstly and then increase when the diameters of agglomerated boron particles decrease. The tap bulk density is the smallest when the diameter of agglomerated boron particles is in the range of 0.25-0.30 mm,meanwhile,the tap bulk density is the biggest when the diameter of agglomerated boron particles is in the range of d≤0.104 mm,and the loose bulk density is the smallest when the diameter of agglomerated boron particles is in the range of 0.30-0.84 mm,at the same time,the tap bulk density increases faster than the loose bulk density.
CHI Xu-hui , PENG Song , PANG Ai-min , ZHANG Shi-ping , WU Feng-jun
2010, 18(3):309-315. DOI: 10.3969/j.issn.1006-9941.2010.03.016
Abstract:NEPE propellant has been exposed to different temperature and humidity environment. Mechanical properties,gel fraction and content of stabilizers have been measured to investigate humidity-heat combination aging characteristic of the propellant. Results show that the humidity-heat aging of NEPE propellants is expressed as a combination of physical aging and chemical aging. The physical aging is in character of humidity aging: mechanical properties change rapidly at first and then slowly as time extending,finaly trend to fixed values. The chemical aging is in character of heat aging: there is a plateau of mechanical properties at the beginning,then a rapid drop succeeds to,and a low plat roof appears in the end. There are cooperative effects in humidity-heat combination stress aging: humidity accelerates chemical aging,and temperature increases depth and velocity of the physical aging. The basic chemical characteristic of heat-humidity aging of NEPE propellants is similar to that of heat aging. But humidity accelerates the depletion of stabilizers and the decomposition of binder network. Namely,humidity decreases apparent active energy of heat aging.
CHEN Zhong-e , LI Zhong-you , YAO Nan , LEI Qing , WANG DU
2010, 18(3):316-319. DOI: 10.3969/j.issn.1006-9941.2010.03.017
Abstract:Sensitivities of FOX-7(RDX)and HTPB propellants with FOX-7(RDX ) were studied by means of DSC-TG,sensitivity test apparatus. Results show that the apparent activation energy of FOX-7 is 245.2 kJ·mol-1 and the major exothermic DSC peak temperature is 222.13 ℃,and friction sensitivity is less than 68% while impact sensitivity is over 25.0 J. Compared with RDX formulations,mechanical sensitivities and electrostatic discharges of HTPB propellants with FOX-7 reduce remarkably. When the content of FOX-7 is 15% in HTPB/AP propellants,the violent decomposition of AP is weakened evidently and the major exothermic DSC peak is about 260 ℃ which is 40 ℃ lower than that of RDX/HTPB formulations.
LI Jun , ZHAO Xiao-bin , WANG Chen-xue , GUAN Hong-bo
2010, 18(3):320-323. DOI: 10.3969/j.issn.1006-9941.2010.03.018
Abstract:In order to study the fragility of NEPE propellant,a simulation device was adopted to test NEPE propellant samples which impacted target at different velocities. The damaged samples were tested in closed bomb and the burning performances of the damaged samples were analyzed. Results show that the maximum pressure rising rate and burning rate of NEPE propellant samples increase with increasing of damaged situation. The NEPE propellant samples firstly burn,and then detonate,when the impact velocity is more than 192 m·s-1.
QIN Neng , LIAO Lin-quan , FAN Hong-jie , LI Jun-qiang
2010, 18(3):324-329. DOI: 10.3969/j.issn.1006-9941.2010.03.019
Abstract:Through deflagration-to-detonation transition(DDT) test,detonator sensitivity test and shock sensitivity test(gap gest),the sensitivity performances of three typical solid propellants,such as NEPE propellant,granule-cast CMDB propellant and screw-extruded CMDB propellant were studied. Results show that the NEPE propellant is sensitive to the detonator igniting,and three typical solid propellants are sensitive to the stimulation of the shock-wave,and there are deflagration-to-detonation transition in the small grain shape granule-cast CMDB propellant,and the interior of the sheet shape screw-extruded CMDB propellant and the NEPE propellant have the cavity. The experiments show that propellant's sensitivity performances have the close relationship with the propellant's composition (have or not have sensitive component),the charge shape (granule or pole) and the outside constraint condition (strong or weak confinement). Tests validate that solid propellant can also occur deflagration-to-detonation transition under some conditions.
HUANG Zhi-ping , TAN Li-min , CAO Qing-wei , MA Xin-gang
2010, 18(3):330-334. DOI: 10.3969/j.issn.1006-9941.2010.03.020
Abstract:The main migrating components in the interfaces of standard Φ25 mm cylinder samples of nitrate ester plasticized polyether (NEPE) based propellant/hydroxyl terminated polybutadiene (HTPB) based liner/ethylene-propylene-diene terpolymer (EPDM) based insulation were quantified by using high performance liquid chromatography (HPLC) and gas chromatography (GC). The results show that plasticizers of nitroglycerin (NG) and 1,2,4-butanetriol tri-nitrate (BTTN),as well as function reagent of AD,which are the main components migrating in the interface,are separated well simultaneously by HPLC,while plasticizer of dioctyl sebacate(DOS) is only found by GC. The recovery ratios of the established HPLC method for determination of NG,BTTN and AD,and GC method for determination of DOS are more than 90%,and the coefficients of variation are less than 6% for these components in the liner. The precision and accuracy of the methods are satisfied for common determination. The results show that NG,BTTN and AD in the propellant can migrate to the liner and insulation with more content in the liner,while AD migrates more obviously than NG and BTTN,and AD even concentrates in the liner. DOS in the liner only migrates to the insulation,not to the propellant.
LIU Jian , SHEN Rui-qi , YE Ying-hua , HU Yan
2010, 18(3):335-338. DOI: 10.3969/j.issn.1006-9941.2010.03.021
Abstract:To understand combustion characteristics of igniter in microscale tube,B/KNO3 combustion in microscale tube were obtained from high-speed photography. Results show that wall heat loss and tube resistance are the main affecting factors for combustion stability. Combustion is stable in 1.0-2.0 mm quartz tube,and B/KNO3 burning rate varies weakly. B/KNO3 burning rate is proportional to combustion chamber pressure among 0.1-4 MPa,however,it is not consistent with exponent law. Combustion is unstable when the inner diameter of quartz tube is decreased to 0.5 mm,and the burning rate is increased with increasing of time. When the inner diameter of quartz tube is reduced further,breakdown phenomenon is produced and combustion quenching is caused. In addition,B/KNO3 burning rate is in inverse proportion to wall thickness in the certain extent.
HU Yan , YE Ying-hua , SHEN Rui-qi , DONG Neng-fa
2010, 18(3):339-342. DOI: 10.3969/j.issn.1006-9941.2010.03.022
Abstract:Al-CuO composite bridge films were successfully deposited on the substrates by means of magnetron sputtering. The morphology and phase constitution of the prepared samples were investigated by SEM and XRD. The Al-CuO composite bridge film was ignited using a constant voltage power supply. The current variations of Al bridge film and Al-CuO composite bridge film were compared. The phase constitution of the composite bridge film after ignition was investigated by XRD. The ignition process of the composite bridge film was recorded by high speed photography. The results show that the composite bridge film has a layered structure,that the films consist of homogeneous and approximatively spherical nanocrystals and that there is a redox reaction initiated by the heat generated from electrification in the Al-CuO composite bridge film.
LIU Yu-jun , LIN Xiang-yang , ZHENG Wen-fang , PAN Ren-ming , LI Sheng-you
2010, 18(3):343-347. DOI: 10.3969/j.issn.1006-9941.2010.03.023
Abstract:Micropore ball propellants were treated by sensitizing agents to improve their flame spread. The effects of variety and content of sensitizing agents on the thermal decomposition and the flame spread speed of micropore ball propellants were studied through dipping process. Results show that peak temperatures of thermal decomposition of the samples decrease obviously with different sensitizing agents. Sensitizing agent A has more effect on peak temperatures,and peak temperatures decrease from 203.1 ℃ to 199.5 ℃ as the content is 5%. The flame spread speed increases markedly with increasing of the content. The sensitized properties of additive agent C is more notable in the sensitizing agents. The flame spread speed increases 3 times as the content of sensitizing agents C is 5%. The increasing extent of flame spread speed of single base sample is higher than that of double base sample with the sensitizing agent A. The impact sensitivity does not change distinctly,but the friction sensitivity increases obviously when sensitizing agent A is introduced. The impact sensitivity increases not more than 10% when the content is less than 16%. The friction sensitivity increases from 58% to 98% as the content is less than 16%. The method for improving flame spread performance by adding sensitizing agent is effective. The content of sensitizing agent should be controlled to avoid the negative effect.
DU Ping , LIAO Xin , WANG Ze-shan
2010, 18(3):348-350. DOI: 10.3969/j.issn.1006-9941.2010.03.024
Abstract:Using 5% multibenzylalkyl multiisocyanate acetone solution as surface-treating reagent,the surface of single-base gun propellant was treated synthetically by chemical and physical methods. The effect of this method on burning performance of single-base gun propellant was studied by constant-volume burning experiment. Results show that the burning performance of single-base gun propellant changes obviously after surface treatment by multibenzylalkyl multiisocyanate. The burning-gas releasing brisance and activity have increased at burning metaphase and anaphase,and which contributes to enhancing energy availability of gun propellant. The burning-gas releasing laws of surface-treated gun propellant accords with the needs of interior ballistics much better. The appropriate thickness of surface-treated layer of this method is about 45 μm,and the effects of controlling burning performances of gun propellant will be depressed by over many surface-treating.
BAI Ying-wei , WANG Ke-xuan , REN Xi , AO Cheng-gang , LI Jun , CHU En-yi
2010, 18(3):351-355. DOI: 10.3969/j.issn.1006-9941.2010.03.025
Abstract:The influence of difference sampling distances in detonation velocity testing for the detonating cords was studied and the testing method was improved. A thin film Mn-Cu sensor was used to test the output shockwave pressure of the detonating cords. On basis of the testing methods,the key affecting factors detonation velocity and shockwave pressure of detonating cords were researched. The testing conditions include temperature,flexibility,linear and non-linear. The conclusions was theoretically analyzed which was based on the semi-empirical formula and the testing results. On basis of the conclusions,mild explosive circuits can be designed more accurately.
LUO Yajun , SHU Yuanjie , HU Xiaoli
2010, 18(3):356-357. DOI: 10.3969/j.issn.1006-9941.2010.03.026
Abstract:9,10Bis(trimethylsilylethynyl) anthracene was prepared by a coupling reaction of dibromoanthracene dibromobenzene and trimethylsilylethyne,using PdCl2(PPh3)2 and CuI as catalysts. A mixed solvent of THF/diethylamide was used as the media of the coupling reaction. The product was obtained with desired yields and it was characterized by IR,UV,1HNMR.
LIU Bo , WANG Qiong-lin , LIU Shao-wu , YU hui-fang , WEI Lun , LI Da , WANG Feng , ZHANG Yuan-bo
2010, 18(3):358-358. DOI: 10.3969/j.issn.1006-9941.2010.03.027
Abstract:The performance of the propellant were improved significantly through adding a special compound in course of the preparation of the modified single base propellant.
LIU Yuan , XIA Ben-li , CONG Ji-xin
2010, 18(3):359-360. DOI: 10.3969/j.issn.1006-9941.2010.03.028
Abstract:Degradation of UDMH waste water by electrolyzed oxidizing water was studied.
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