BACK TO REFERENCES AND ABSTRACTS

Chemical Interaction and Properties

1. Dissolution Properties of 3, 4-Dinitrofurazanfuroxan in N-Methl-2-pyrrolidone and Dimethyl Sulfoxide
XUE Liang1, 2, ZHAO Feng-qi1, XING Xiao-ling1, GAO Hong-xu1, XU Si-yu1, HU Rong-zu1
1. Xi'an Modern Chemistry Research Institute, Xi'an 710065, China
2. Shaanxi Normal University, Xi'an 710062, China

Abstract: The enthalpies of dissolution of 3, 4dinitrofurazanfuroxan(DNTF) in N-methl-2-pyrrolidone(NMP) and dimethyl sulfoxide(DMSO) were measured using a RD496-2000 Calvet microcalorimeter at 298.15K under atmospheric pressure. Differential enthalpies(ΔdifH) and molar enthalpies(ΔsolH) were determined for DNTF in different solvents. The corresponding kinetic equations that describe the two dissolution processes are dα/dt=10-3.81(1-α)1.19for dissolution process of DNTF in NMP, and dα/dt=10-3.91(1-α)0.88 for dissolution process of DNTF in DMSO.

2. Study on the Formulation of Low Burning Rate HTPB Propellant with RDX
CAO Wen-zhong, WANG Zhong-wei, JIAO Shao-qiu, ZHANG Wei-hua
College of Astronautics and material, National University of Defense Technology, Changsha 410076, China

Abstract: The formulation with solid content of 87.5% for low burning rate HTPB propellant with RDX was prepared to satisfy the SRM requirement. The effects of dosage of RDX and modified ammonium oxalate(CA)on the thermodynamic parameters were studied by the minimum free energy method via theoretical calculation. The BSFΦ165 SRM test were carried out to test the burning rate and specific impulse. The results show that the thermodynamic parameters can be affected by changing the dosage of RDX and modified ammonium oxalate for the low burning rate HTPB propellant with RDX, when the mass ratio of RDX and CA are 10% and 2.0%, respectively, the specific impulse is 2374N•s•kg-1, specific impulse efficiency is 0.919, burning rate is 4.12mm•s-1. The requests of low burning rate can be satisfied by adding modified ammonium oxalate and changing particle gradation of AP when the energy of the formulation invariable.

3. The Glass Transition Temperature for Double Base Propellant
LIU Zi-ru, ZHANG La-ying, HENG Shu-yun, KANG Bing
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The molecular structure relaxations and glass transition process in double base propellants were reviewed. The methods used to detect glass transition process were briefly introduced. The main influence factors on determination of the glass transition temperature for double base propellant were analyzed. It is suggested that tanδ peak temperature in α relaxation obtained from DMA is considered as a glass transition temperature for double base propellant.

4. Study on the Gas-Products of Olympic Kindling Spark in Simulation Test of Jolmo Lungma
HU Lan, WANG Jing-na, GAO Lang-hua, ZHANG Ting
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: 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.

5. Specific Heat Capacity, Thermodynamic Properties and Adiabatic Time-to-Explosion of RDX
XU Kang-zhen1, CHANG Chun-ran1, SONG Ji-rong1, 2, GAO Hong-xu3, LI Meng1, MA Hai-xia1, ZHAO Feng-qi3, HU Rong-zu3.
1. College of Chemical Engineering/Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi'an 710069, China
2. Conservation Technology Department, the Palace Museum, Beijing 100009, China
3. Xi'an Modern Chemistry Institute, Xi'an 710065, China

Abstract: The specific heat capacity of RDX was determined with the continuous Cp mode of microcalorimeter(Micro-DSCⅢ, SETARAM). Quadratic equation of Cp with temperature was obtained. The standard mole specific heat capacity of RDX was 251.17J•mol-1•K-1 at 298.15K. Furthermore, specific heat capacity of RDX was calculated by DFT-RB3LYP/6-311++G** method in Gaussian 03W package, the results of theoretical calculation are all lower than those of experiment determination, the relative deviation ranged from 12.72% to15.94% within 280～350K. Using the above determination results of specific heat capacity, thermodynamic functions of RDX, relative to the standard temperature 298.15K, were calculated through thermodynamic relationship, and adiabatic time-to-explosion was also obtained to be a certain value of 3.10-3.19s.

6. Specific Heat Capacity, Thermodynamic Properties and Adiabatic Time-to-Explosion of NTO
LI Zhao-na1, MA Hai-xia1, SONG Ji-rong1, 2, ZHAO Feng-qi3, XU Kang-zhen1, HU Rong-zu3
1. College of Chemical Engineering/Shaanxi Key Laboratory of Physico-Inorganic Chemistry, Northwest University, Xi'an 710069, China
2. Conservation Technology Department, the Palace Museum, Beijing 100009, China
3. Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The specific heat capacity of NTO was determined with continuous Cp mode of microcalorimeter(Micro-DSCⅢ). In the determining temperature range from 283K to 353K, the special heat capacity of NTO presents good linear relation with temperature, the relationship between the specific heat capacity of NTO and the thermodynamic temperature was Cp=0.2806+2.7103×10-3T, the standard mole specific heat capacity of NTO was 141.53J/mol/K in 298.15K. Using the determined relationship of Cp with temperature T, thermodynamic functions(enthalpy, entropy and Gibbs free energy) of NTO between 283K and 353K, relative to the standard temperature 298.15K, were derived through thermodynamic relationship. Using the relationship between Cp and T and the thermal decomposition parameters, the time of the thermal decomposition from initialization to thermal explosion(adiabatic time-to-explosion) was obtained, which is between 1.95s and 1.99s.

7. The Hydrous Gibbs Free-energy and Hydrous Entropy Change of NTO Anion and the Enthalpy Change of Hydrous Process of System [M~(n+)(g)+nNTO~-(g)+mH_2O(g)]
ZHAO Feng-qi, HU Rong-zu, XU Siyu, GAO Hong-xu, YI Jian-hua
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: A simple formula of estimating the standard hydrous Gibbs free-energy of NTO anion ΔhGθm(NTO-, g) was presented. The values of ΔhGθm(NTO-, g) of-267.24kJ•mol-1 and ΔhSθm(NTO-, g) of 380.71 J•(K•mol)-1 were obtained by the established formula and thermodynamic relation. The enthalpy changes of hydrous processes for systems [Mn+(g)+nNTO-(g)+mH2O(g)](M=La, Ce, Pr, Eu, Sm, Gd, n=3, m=7;M=Y, Yb, n=3, m=6;M=Dy, Tb, n=3, m=5;M=Nd, n=3, m=8) were obtained by a tehrmochemical cycle.

8. Determination of Standard Value of RDX and HMX Content by Electrode Potential Titration in Non-aqueous Solvent
LIANG Yi, ZHANG Gao, CHEN Zhi-qun, LIU Hong-ni, WEN Xiao-yan
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: A method to determine the content of hexahydro-1, 3, 5-trinitro-s-triazine(RDX) and hexahydro-1, 3, 5, 7-tetronitro-sterazine(HMX) by electrode potential titration in non-aqueous solvent was established. The factors of affecting the experiment, such as non-aqueous solvent, titrant, concentration of titrant, endpoint of electrode potential, were determined. The optimal electrode potential titration conditions obtained were dimethylsulfoxide(DMSO) as non-aqueous solvent;sodoum mothoxide(CH3ONa) as titrant;CH3ONa concentration, 0.30mol/L;EQP of electrode potential titration curve as endpoint. The purity of RDX obtained by eighteen times of measurements is 99.554% to 99.865% with the relative standard deriation(RSD) of 0.0976%. The purity of HMX is 99.565% to 99.888%, the value of RSD is 0.10%. The method is facile and dependable.

9. Regulations of Plane Strain Fracture Toughness of PBX Changed with Temperatures
WEN Mao-ping, PANG Hai-yan, TIAN Yong, LI Jing-ming
Institute of Chemical Material, CAEP, Mianyang 621900, China

Abstract: The plane strain fracture toughness (K_(ⅠC)) of three kinds of PBX named JOB, JO, JB respectively have been tested at different temperatures by three-point bending experiment. The results show that with temperature increasing, the values of K_(Ⅰc) of three kinds of PBX all decrease, when temperature is higher than 45℃, the values of (K_(ⅠC))of JOB decreases soonest, and when temperature is up to 60℃, the plane strain fracture toughness of JOB becomes very poor, even lower than JO, the values of K_(ⅠC) of JB is higher than those of JOB and JO at different temperatures, showing the stronger ability of JB to resist crack expanding. The component and content of high polymer in the PBX are principal factors affecting the change rule of K_(Ⅰc) with temperature.

10. Structure Design of Solid Propellant Database System
LI Shi-peng1, WANG Ning-Fei1, LIU Yun-Fei2, TAN Hui-min2
1. School of Aerospace Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2. School of Material Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Abstract: Due to the requirement of formulation management and thermodynamics calculation of solid propellant, an analysis of the solid propellant database need and classifications of performances and formulation data of solid propellant were performed. The formulations and performance data of about 20 kinds of standard solid propellant and thermodynamics data of over 1000 kinds of compounds assembled by 50 kind elements commonly used in solid propellant component and combination gas component were analyzed. The database structure, contents of data tables, relationships of the tables, the query and display windows were constructed. The operation of the database, data reliability and security were planned. The finished database had virtues of great data capacity, concise structure, good expansion and friendly interface.

11. Application of Aramid Fiber Treated Insurface in Hydroxy Rubber Composite Materials
LU Xi'an g-hui, CAO Ji-ping, SHI Ai-juan, CHEN Guo-hui, WANG Ji-gui
Xi'an Modern Chemistry Research Institute, Xi'an

Abstract: In order to improve the smooth surface and chemical inert of aramid fiber and poor adhesiveness of aramid fiber with hydroxy rubber materials, the surface of aramid fiber is modified with silicon coupling agent KH-550. The change of fibers and hydroxy rubber in surface is determined by ESCA and SEM. The results show that the content of carbon element decreases and the contents of nitrogen and oxygen element increase. The activity of surface of fiber is increased. The tensile strength of aramid fiber/hydroxy rubber composite materials is increased from 2.58MPa to 3.22MPa. The weight of hydroxy rubber on surface of hydroxy rubber obtained by SEM is more than untreated fiber composite materials. Under the conditions of the content of KH-550 5% and treating time 5hours, the treating effect on aramid fiber is best.

12. Application of Methyl-Violet Test in Storage Stability of Propellants
ZHANG Li~1, DU Shi-guo~1, XU Lu-tie~1, XU Tong-jun~2
1. Department of Ammunition Engineering, Ordnance Engineering College, Shijiazhuang 050003, China
2.63981 Division of PLA, Wuhan 430311, China

Abstract: In order to determine the reliabitity of methyl-violet test in storage stability determination of preopellant, methyl-violet tests at 134.5℃ and 120℃ are taken respectively for each sample of single-base propellant, double-base propellant and triple-base propellant aged at 85℃. The stabilizer content is determined by chemical analysis method. The relationship between the changes of color change time of methyl-violet test paper and stabilizer content in propellants with ageing time are analyzed by variance test. The results show that the relationship between the color change times of methyl-violet test paper with ageing time is obvious for single-base propellant, double-base propellant and modified double-base propellant and not obvious for double-base rocket propellant and tri-base propellant.

13. The Characteristics of Dynamic Mechanical Properties for Aged Double-Base Propellant H01
ZHANG La-ying, LIU Zi-ru, HENG Shu-yun, ZHANG Lin-jun, YIN Cui-mei
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The aging properties of double-base propellant H01 under 65℃ were measured by a dynamic mechanicalanalyzer. In lower temperature range-10~40℃, the values of loss tangent tanδdecrease obviously and the peaksofβrelaxation become more clear with increasing the aging time. The changes of the peak temperature of tanδatαrelaxation, values of dynamical compliances J' and J", and superposition vertical shift factors of master curves ofstorage modulus E' , loss modulus E" , J' and J" for DB propellant H01 with aging times are regular. The TG-DTGtest results show that the mass-loss of samples at 183℃ decreased as the aging time increased, indicating that thecontents of the plasticizer in DB propellant H01 decreased as the aging time increased. Therefore, it is shown thatthe decrease in the plasticizer must also be a main reason to lead to the decrease in above-mentioned“mechanicalloss”, except for the“physical aging”resulting from the structural relaxation.

14. Influence of Storage Condition on Adhesive Force for Rocket Motor Propellant Charge with Brush Structure
CHEN Ming-hua~1, LIU Hai-tao~1, JIANG Jin-yong~1, LI Dong-yang~1, FENG Tao~2, LIU Hai-feng~3
1. Ordnance Institute of Technology, Shijiazhuang 050000, China
2. Vehicle and Ship Provision Station of Equipment Headquarters, Beijing 100090, China
3. Ballistic Test Station of Beijing Military Area, Xuanhua Hebei 075146, China

Abstract: 32 Rocket motors stored in the four areas, temperate zone, tropics, inland semitropics, and coastal semitropics, and two different sites in each area, depot and field for 5 years were selected to study the influence of the storage conditions on adhesive force of rocket motor propellant charge with brush structure. The adhesive forces of 8 pieces of propellant in different position for each rocket motor were measured with the pulling force apparatus, and the experimental results were disposed and analyzed based on rank sum test method. According to experiment and analysis, the adhesive forces of propellant for 32 rocket motors were obtained. The average values of adhesive force are in the range of 62.11-134.79N. There is remarkable influence of storage area on the adhesive force of propellant between temperate zone and tropics, tropics and inland semitropics, tropics and coastal semitropics, but there is no remarkable influence between other storage areas for the same kind of storage site. There is no remarkable influence of storage site on the adhesive forces of propellant for the same kind of storage area.

15. Estimation Method and Results of Safe Storage Life for Nitrate Ester Propellants
HENG Shu-yun, HAN Fang, ZHANG Lin-jun, LIU Ju-ping, YUE Pu
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The principle and method of estimating the safe storage life of propellants using the thermal accelerating aging test. The thermal accelerated aging for nitrate propellants was carried out at temperatures of 95, 90, 85, 75 and 65℃. The time required to consume the effective stabilizer of 50% defined as the end point of safe storage life of nitrate propellants. The values of the end point(τ) at various aging temperatures(t) are fitted to Bethelot's equation t=a+blgτ by regression analysis. The safe storage life at 30℃ was estimated. The estimated results of safe storage life for 80 kinds of nitrate propellants are collected. The results show that the estimated values of safe storage life for single-base, double-base and tri-base gun propellants and double-base propellant are more than 40 years, but those for modified double-base propellant containing ammonium perchlorate and nitrotriglycol are less than 40 years. The differences between results obtained from four and five temperature points by regression analysis are compared. A proposition of deleting the aging test at 90℃ and adding the test at 55℃ is presented. Based on statistical results of low temperature tests and temperature coefficient of aging decomposition rate, a simple approach of estimating the safe storage life for nitrate propellants from the aging test for short period at a single temperature(65℃) is proposed.

16. Ablation Performance of Unsaturated Polyester Inhibitor
LI Dong-lin, CAO Ji-ping, WANG Jigui
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: Unsaturated polyester(UP) inhibitor has many advantages and has been widely used in many rocket motors and gas generators, but it also has the disadvantage of high ablation rate. So the investigation, to improve the ablation performance of UP inhibitor via the method of adding flame retartants and anti-ablation fibers to resin matrix, has been performed. The samples of UP inhibitor modified with carbon fibers and aluminium hydrate has been prepared, its ablation rates and mechanical properties have been determined experimentally according to relevant standard methods. The test results indicate that the effect of carbon fibers on ablation performance of the inhibitor samples is obvious, and the aluminium hydrate filler has minor effect. With the content and fiber length of carbon fibers increasing, the linear ablation rate of UP inhibitor samples has significantly reduced. The linear ablation rate of UP inhibitor has reduced from 0.653mm/s(baseline sample) to 0.252mm/s, and simultaneously the fillers has no effect on the viscosity of inhibitor slurry. The ablation performance of modified UP inhibitor has also been validated via Φ50mm motor test, and the result is desired.

17. Characterization of the Concentration Distribution of Deterrent in Propellant by Extraction/GC
CAO Hong-an, JIANG Jin-yong, LU Guie
Ordnance Engineering College, Shijiazhuang Hebei 050000, China

Abstract: In order to characterize the concentration distribution of deterrent camphor in propellant, propellant sample was immersed in an acetone/petro-ether solvent to extract camphor, the camphor concentration c in the solvent at different extraction time t was determined by GC and the c vs. T curve was used to characterize the concentration distribution of deterrent camphor in propellant. The results obtained by repeatability experiments show that for the same sample, the c-t curve is repeatable, that is, the c-t curve is determined only by the concentration distribution of deterrent camphor in propellant if the experiment conditions keep the same. The results obtained by relativity experiments show that when the concentration distribution of camphor in propellant changed or for samples with different concentration distributions, the c-t curve is also changed. Therefore, it is reasonable to describe concentration distribution of deterrent camphor in propellant with extraction/ GC.

18. RDX Migration in TEGN-Propellant under High Temperature Storage
XU Wan-yu, HE Wei-dong, ZHANG Ying
Chemistry School, Nanjing University of Science and Technology, Nanjing 210094, China

Abstract: The migration behavior of RDX in high energy TEGN propellants was studied by means of DSC and chemical analysis. The results show that the mass percentage of RDX in various sites of TEGN propellants before and after accelerating aging at a temperature of 65℃ for four months is about the same. The mass percentage change of RDX during storage is within error ranges, indicating that the particle size of RDX in TEGN propellants has no significant effects on its migration properties. The RDX contents determined by two kinds of measurement methods, DSC and chemical analysis agree with each other, showing that DSC is one of effective methods in studies of component migration behavior of propellants containing high energy solid additives.

19. Measurement of the Deterrent Distribution for Propellant by Extraction
YE Jing
Ordnance and Armor Department, Equipment Headquarter, Chengdu Military Region, Chengdu 610031, China

Abstract: In order to establish the method of determining the depth in propellant and distribution of deterrent, the deterrent was extracted from camphor-deterrented single-base gun propellant with dichloromethane in the ultrasonic washer with the frequency of 45kHz, at the temperature of 20℃ and in the different extracting times. The content of camphor in extraction solution was measured by GC. The propellant volume extracted in different time interval was calculated, and the propellant depth vs. Camphor content relationship was plotted through the conversion of the volume to the depth of propellant. The results show that the method describing the deterrent distribution by the relationship between the propellant depth from surface to inside and the corresponding camphor content is more reasonable but the requirement for experimental condition and operation for the method is more strict.

20. The Characterization of Aging Property of Modified Double-base Propellant GS-1 by Dynamic Mechanical Analyzer
ZHANG La-ying, LIU Zi-ru, HENG Shu-yun, ZHANG Lin-jun, ZHANG Pei, YIN Cui-mei
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The mechanical properties of GS-1 modified double-base propellant aged for various days at 65℃ were characterized by using the dynamic mechanical analyzer. In lower temperature range(-50～10℃), the values of tanδdecrease obviously and the peaks of β relaxation become more clear with increasing aging time. In higher temperature range, the peak temperature of tanδat α relaxation increases and the values of dynamic compliance J′ and J″ decrease, and the vertical shift factors of master curves of dynamic modulus E′ and E″ of aged GS-1, which were superposed on the master curve of unaged GS-1, decrease and the vertical shift factors of J′ and J″ increase as the aging time increased up to 15 days. It is found from TG-DTG data that the mass-loss of samples decreased as the aging time increased, indicating that the contents of the plasticizer(nitroglycerine)in GS-1 decrease as the aging time increases. Therefore, it is shown that the decrease in the plasticizer must also be a main reason to lead to a decrease in above-mentioned "mechanical loss", except for the "physical aging" resulting from the structural relaxation. While aging time longer than 21 days, these "mechanical loss" are arose, due to formation of gas bubbles in propellant GS-1.

21. Improvement on Technological and Mechanical Properties of HTPB Based PU IPN by PBMA
ZHANG Lei, CHU Li-qiu, TAN Hui-min
School of Material Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Abstract: A series of IPNs were synthesized by BMA and HTPB based PU. The viscosity of prepolymers was tested. The results demonstrate that the viscosity of prepolymers decreased to less than 0.500Pa•s. The technological properties of IPNs were evidently enhanced with the introduction of BMA. The result of tensile test showed that the tensile strength of IPN films was 1.432MPa, and the elongation at break was 576.614%. BMA had important effect on the improvement on mechanical properties of IPNs. The critical initiator contents of split phase in different PU/PBMA compose ratios were determined. The initiator content and the catalyst content were discussed in detail. The results show that good mechanical properties could be reached when the value of R was between 0.95 and 1.

22. Research of a New Kind Epoxy Resin Room Temperature Curing System
NING Bao-jiang~1, NING Rong-chang~2
1. The North West China Research Institute of Electronic Equipment, Xi'an 710065, China
2. Department of Chemical Engineering Northwest Polytechnical University, Xi'an 710072, China

Abstract: The main composition of the TA-70 solidifying agent is determined by IR. The gelatinization test shows that TA-70 is a room temperature curing agent of curing the E-51 epoxy resin. The gelatinization time of the E-51/TA-70 system is 98min at 20℃. Mechanical properties of the E-51/TA-70 curing system are determined as: tensile strength, 80.64MPa. Tensile modulus, 3.18GPa;bending modulus, 148.9MPa;impact strength, (40.2kJ•m~2);Heat deformation temperature(HDT) , 110℃;glass transition temperature(T_g), 113.37℃, Information and mechanical properties of the fiber resinforced E-51/TA-70 system is obtained on adhesive joint strength of E-51/TA-70 curing system as adhesive.

23. The Determination of Aniline in p-Diphenylamine with Constant Value of pH Titrate Method
ZHANG Cui-mei, ZHOU Ji, XU Zheng
Branch of North China Engineering College, Taiyuan 030008, China

Abstract: With the help of the addition of a suitable concentration solution of HCl to a series of different content aniline standard solutions until the value of pH of a certain number and the read of the value of HCl consumed, a graph for this titration carried out in 95% ethanol solution is made. The linear correlation coefficient of the curve is 0.996. According to this curve, the content of aniline in an unknowable sample from the volume of HCl consumed in the titration is determined. This method is used in the determination of the content of aniline in diphenylamine. The results show that the method is very accurate with relative error of less than 1.2%, and related mean deviation of 0.2% and the determination is irrespective of the presence of diphenylamine. Compared with ordinary methods, it needs neither separate aniline from diphenylamine nor standard action titratant.

24. Statistical Analysis of the Journal of Explosives and Propellants Cited by the Ei
WANG Wen-dian
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The paper introduces the Ei's history and databases, and discusses the principles of selection of sci-tech periodicals as well as requirements of English abstracts required by the Ei. It indicates three layers of source periodicals (including the core, selected and enlarged periodicals) selected by the Ei, and the main differences between the Ei Compendex and the Ei Page One databases are given. It also make a statistical analysis of the Journal of Explosives and Propellants which has been cited by the Ei.

25. Overview of Low Molecular Mass Organic Gelators Gel Propellants
LIU Kai-qiang, QU Yu-long, WANG Ming-zhen
School of Chemistry and Materials Science, Shaanxi Normal University, Xi′an710062, China

Abstract: The properties of low molecular mass organic gelators (LMOG), steroid-based derivatives, organometallic compounds, and metal salts of fatty acids so on, are systemically introduced, and the application of organogels in propellants, oil solidification on sea, design micro mechanics, substance separation and other aspects have been overviewed briefly, and the main factors affecting the gelling abilities of LMOGs have been discussed in detail. Based on these, some suggestions related to this field have been brought out in this paper.

26. The Intelligent Management of the Compounds Properties Database
WANG fang, TIAN De-Yu, LIU Jian-hong
Shenzhen University, Shenzhen518060, China

Abstract: A database of compound properties of about 5 000 common compounds established under Microsoft access 7.0 is intelligently managed using Visual Basic as system Language. Performances shch as retrieving , adding, deleting , modifying , printing and saving etc. are successfully realized. Formula weight of a compound can be calculated.

27. Study of the Performance of Explosive CL-20
CHEN Luying, YANG Peijin, ZHANG Linjun
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: By means of the theoretical calculation and basic test, the important performances of high energy and density material CL20 are given. The explosion energy, mechanical sensitivity and heat resistibility of material CL20 are described, showing that its energy and mechanical sensitivity are higher than that of HMX, while iysheat resistibility is close to that of RDX.

28. Design of the Solid Propellant Formulation and Property Database
ZHANG Haina, PANG Jun, FENG Wei, WANG Ningfei
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: The solid propellant formulation and property database (SPFPD) is designed, while a number of solid propellant formulations and property data are analyzed. SPFPD consists of some study results and basic reference data tables in the propellant formulation field. Visual C++ language is used to design an objectoriented database application system under Windows98 operation system. This system can be used to inquire and update the data of the database or to process experimental data of the burning rate.

29. Study on Thermal Expansion Coefficient of TATB-based PBX
LI Yubin, ZHENG Xue, SHEN Ming, LI Jingming
Institute of Chemical Materials, CAEP, Mianyang621900, China

Abstract: The linear coefficient of thermal expansion of the TATBbased PBXs are measured by thermal expansion apparatus, and the effect of composition and technology on CTE are also studied. The results show that the CTE values of fluoropolymer bonded TATB between ambient temperature and 70℃ are very great, and the distinction in physical properties of fluoropolymer have no clear effect on CTE. By using a binder with high glass transition temperature (Tg) instead of F2314 , the CTE of pellets between ambient temperature and 70℃ are remarkably decreased. The CTE values of samples pressed isostatically are smaller 30% than samples pressed mechanically between ambient temperature and 70℃. The CTE of TATBbased PBX can be lowered 20% by means of repeated thermal cycle.

30. A Spectrophotometric Method for Determining Sucrose Octaacetate in Propellant Materials
TIAN Hong yuan, GE Yan ping, QIN Chao mei, ZHAO Tie zhu , NING Yan li
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: In this paper, colour reaction between sucrose octaacetate (over the range 0to350ug)and anthrone reagent has been studied. Beer law was obeyed at 620nm. The method is sensitive, selective and rapid, it has been used to determination of sucrose octaacetace in propellant materials with satisfactory result.

31. Investigation of Transfer Silicone Pressure-sensitive Adhesive Cured at Room-temmperature
LI Mao guo
Institute of Chemical Materials, CAEP, Mianyang 621900, China

Abstract: In this paper, a transfer silicone pressure sensitive adhesive (PSA) cured at room temperature was intrudoced. Peel strength of PSA from PBX 1, PBX 2 and aluminium was 5.04 N/25 mm, 3.07 N/25 mm and 17 N/25 mm respectively. Compatibility of the PSA with PBX 1, PBX 2 meet the malitary standard. The PSA was transfered to silixane rubber foam cushion, subsequently bonded to aluminium at 60 ℃ for 48 h, the surface of aluminium hadn't residual of PSA after debonding.

32. Research on three novel bonding agents in Nitramine-filled Propellants
LEI Ying jie, YANG Wen bao, HU Rong zu
Beijing Institute of Technology, Beijing 100081, China

Abstract: The effects of three novel bonding containing polyether of heretocycle amide on improving the mechanical properties of nitramine filled propellants are studied by using the impact strength test and DSC analysis. The possible coupling mechanism is discussed. Information is obtained on the compatibility of nitramine filled propellant with three bonding agents.

33. Study on High-energy LOVA Propellant
LIAO Xin, HUANG Zhen-ya, YANG Wen-bao, WANG Ze-shan
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: By choosing the binds, plasticizers and burning modifiers, designing the formula and numerical calculating, the formulation of LOVA propellant has determined by using RDX as the main energetic composition with inert and energetic complex bi nders, complex plasticizers and combustion modifiers. The closed bomb testing sh ows that the designed formula of LOVA propellant has the characteristic of high energy and low erosion. The solvent-extruding process is demonstrated practicab le for this kind of LOVA propellant formula.

34. The Structure of 2, 4, 8, 10-tetrabenzyl-6, 12-dibenzoyl-2, 4, 6, 8, 10, 12-hexaazatetracyclo [5.5.0.0~(5, 9).0~(3, 11)] dodecane
QIU Wen ge, CHEN Shu sen, YU Yong zhong
Beijing Institute of Technolgy, Beijing 100081, China

Abstract: The Structure of 2, 4, 8, 10 tetrabenzyl 6, 12 dibenzoyl 2, 4, 6, 8, 10, 12 hexaazatetracyclo [5.5.0.0 5, 9 .0 3, 11 ] dodecane was determined by 1H 13 C NMR (include DEPT 135°) and 2D NMR (HMQC, HMBC and NOESY). Its 1H and 13 C spectra were completely assigned, meanwhile, some interesting long range 13 C - 1H and 1 H - 1H correlation was found.

35. Prediction of Molar Volume for Explosive Molecular Using Edge Adjacency Index
HUANG Jun, ZHOU Shen fan, TANG Wan ying
College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Abstract: Edge adjacency index is a topological index derived from Randic's graph theory index. This paper used the algorithm of Estrada to calculate 62 explosive moleculars' edge adiacency index, and established a relative equation between the indexes and the molar volume(MV) values. The results showed that the correlation was significant (r=0.9646) . The yield equation was proved to be robust, and is suitable for the prediction of molar volume for explosive moleculars.

36. The Method of Determination of K_2SO_4 Content in Propellant by Potentiometric Trituration
ZHOU Ji, ZHANG Cui mei
North China Institute of Technology, Taiyuan 030008, China

Abstract: After testing the K 2SO 4 content in propellant by means of poteniometric trituration, it can be concluded that if the sample of propellant is used to dissolve acetone on the condition that 75% acetone is its trituration medium, the error of the testing results is less than 2%, and its standard error is 0.02. Furthermore, if concentrated nitric acid is used to destroy the sample, on the condition that 70% alcohol is its trituration medium, the error is less than 0.2%, and its recycling rate will be over 99.8%, thus the standard error is 0.001.

37. Adhesion of HMX Polymer Bonded Explosive
ZHAO Qi, FENG Chang gen, HUANG Yi min
The Institute of Chemical Materials, CAEP, Mianyang 621900, China

Abstract: The contact angles of methanamide and water to the surface of columned HMX polymer bonded explosive were tested. And the contact angles are 82° and 32° respectively. The surface energy of columned HMX polymer bonded explosive was calculated. The result shows that the surface of HMX polymer bonded explosive is slow energy surface, and its surface energy is 91mN/m. It was compared that the shear strength of some structure adhesives to the columned HMX polymer bonded explosive. The shear strength was 7.6MPa when the epoxy adhesive was used. It was proved by experiments that the species and thickness of adhesives have little influence on the adhesion strength.

38. Regioselectivity of Halobenzenes Nitration by Using Nitric Acid in the Presence of Acidic Bentonite
PENG Xin hua, LU Chun xu
Nanjing University of Science and Technology, Nanjing 210094, China

Abstract: One of the main goals of aromatics nitration is to set up a regioselective methods in order to meet desirable environments. Para selectivities of halobenzenes were enhanced by using nitric acid as a nitrating agent in the presence of acidic bentonite catalyst. The ratios of ortho and para nitroisomers in products of mononitration of flurobenzene, chlorobenzene, bromobenzene and iodobenzene were 0.13, 0.29 and 0.42 respectively.

39. Oxidation Debenzylation and Acetylation of Hexabenzylhexaazaisowurtzitane
CHEN Shu sen, QIU Wen ge, YU Yong zhong
Beijing Institute of Technology, Beijing 100081, China

Abstract: By treating 2, 4, 6, 8, 10, 12 hexabenzyl 2, 4, 6, 8, 10, 12 hexaazatetracyclo[5.5.0.0 5, 9 .0 3.11 ]dodecane with Ac 2O/KMnO 4, two new compounds 2 acetyl 6, 8, 12 tribenzoyl 4, 10 dibenzyl 2, 4, 6, 8, 10, 12 hexaazatetracyclo [5.5.0.0 5, 9 .0 3.11 ]dodecane and 2, 8 diacetyl 6, 12 dibenzoyl 4, 10 dibenzyl 2, 4, 6, 8, 10, 12 hexaazatetracyclo[5.5.0.0 5, 9 .0 3.11 ]dodecane were obtained. It shows that acetylation occurred after oxidative debenzylation.

40. Research on the Mechanical Property of GAP Copolymer Elastomer
LI Ping, CHENG Qiang, LI Xu li, GAN Xiao Xi'an , YU Hong jian
Xi'an Modern Chemistrg Research Institute, Xi'an 710065, China

Abstract: BAMO/THF, PTE and PEG are used to improve the chain property by copolymering with GAP. The results show that the mechanical properties of elastomers composed of binary polyether are much better than those of single polyether. Particularly when the weight rato of two composition in the elastomer is near 1, the tensile (δ)and the percentage of elongation (ε) reach to the highest in GAP/BAMO and GAP/PTE. DSC resulls show the two polyether are compalible, and they probably form crosslinking network chain together by block copolymerization.

41. Effect of Composition of HYCARs on their Compatibility with NC
SHAO Zi qiang, Yu M Lotmentsev
North China Institute of Technology, Taiyuan 030051, China

Abstract: By use of the data on the statistical sorption of solvent vapor, the Gibbs free energies of mixing of cellulose nitrate and nitrile-butadiene rubbers with various contents of acrylonitrile groups were calculated. It was shown that increasing fraction of polar groups in the rubber extended the range of compatibility of these polymers, until at 40% acryonitrile the components became completely compatible.

42. Study on the Method of Adjusting the Oxygen Balance of Propellant
WANG Qiong lin
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China

Abstract: Gun muzzle smog is strongly related to oxygen balance of gun propellant. Caculations and tests show that the oxygen balance of deterrent-coated gun propellant can be significantly increased by decreasing the concentration of deterrent or adopting new materials with high percentage of oxygen. It is critical to use oxygen-rich materials, especially those of nonenergetic materials to increase the oxygen balance of propellant so as to eliminate gun muzzle smog.

43. Study on the Subsidence Property of Superfine HMX Suspension
HAN Ai jun, YE Ming quan, BAI Hua ping, LI Feng sheng, HAN Fang
Nanjing University of Science and Technology, Nanjing 210094, China

Abstract: On the basis of the property of superfine explosive HMX suspension and mechanisms of agglomeration coagulation, influences of different agglomerants and coagalants used alone or complexly on the subsidence property of superfine HMX suspension are studied, thus different using ways are compared.

44. Relationship between Viscosity and Concentration of Nitrocellulose

LUO Yun jun CHENG Rong shi TAN Hui min
Beijing Institute of Technology, Beijing 100081

Abstract: The viscosity properties of nitrocellulose in dilute solution were studied in this parer. The viscosity of nitrocellulose in extremely dilute solution, when the solution concentration is under a value, rose rapidly with the reduction of the solution concentration. The inverstigation shows that the reason is because of the adsorption of nitrocellulose molecular on the wall of capillary, the transitional concentrations in dilute solution area correspond to the critical concentration of polymer solution. The way estimating the critical concentration theoretically was given.

45. Research on the Adhesion of Cured Silicone Rubber and Metal

Tang Guifang Liu Zhe Li Wei
Xi'an Modern Chemistry Research Institute, Xi'an 710065

Abstract: This paper introduces resolving the adhesive problem between cured silicone rubber and metal by B 4 surface treatment agent.

46. Novel Developments in High energy Oxidizer HNF and HNF based Propellants

Zhang Haiyan Chen Hong
Xi'an Modern Chemistry Research Institute, Xi'an 710065

Abstract: A review of the western countries' novel developments in the research of high energy hydrazine nitroform (HNF) and HNF based propellants. Topics include: the development background on HNF; the practical value of HNF in the solid propellant formulation which is proved by its physical chemical characterization analysis and also the various performances of propellants using HNF as oxidizer, GAP as binder, Al as fuel.

47. Study on Reducing AN Absorptivity with Surface Active Agents and Additives
Chen Tianyun Lu Chunxu
Nanjing University of Science and Technology, Nanjing 210094

Abstract: The special surface treatment was used to AN with compound surface active agents and additions. The AN′ absorptivity was measured, and the theoretic reasons of reducing AN' absorptivity were analyzed. The experimental results proved that AN' absorptivity could effectively reduce with compound surface active agents and additions.

48. The Influence of Catalysts on AP/HTPB Composite Propellant Condensed Phase Thermal Effect
Wong Wujun Peng Wangda
National University of Defense Technology, Changsha 410073

Abstract: The influence of CuO, Cr_2O_3, Co_2O_3 and calcined products of these carbonates on AP/HTPB composite propellant condensed phase thermal effect are investigated in this papaer. It is discovered from experiments that most catalyst can increase altogether decomposition heat of propellant, especially enhanced condensed phase interface reaction of oxizider with binder, calcined products of Cu_2(OH)_2CO_3 and Co 2(CO 3) 3 can enhance endothermic decomposition reaction of binder.

49. Study on the Heat Resisting Coating Materials used in Projectile
Wu Xiaoqin Li Baoai Wang Deqiang
North China Institute of Technology, Taiyuan 030051

Abstract: This paper introduces interrelation between the properties of used in heat resisting materials and heat resistance, water absorption, adhesion. With the changing of coating properties and prescription, the adhesion, heat resistance and waterproofness may be improved.

50. The Colligative Property of Glass Transition Temperature and the Inference of the Microstructure for the Ternary System of HAN TEAN H_2O
Liu Ziru Yin Cuimei Hou Jianping Kong Yanghui
Xi'an Modern Chemistry Research Institute, Xi'an 710065

Abstract: The correlations of glass transition temperature(T g) with the content of H 2O for the ternary systems of HAN TEAN H 2O at nine ratios of HAN/TEAN have been investigated by DSC. An inferecne of the molecular structure of the system has been made from the change of T g. In this paper, the influence of the TEAN content on T g was also discussed and the ternary system was compared with the binary system of HAN H 2O.

51. The Change Laws of Mass and Intrinsic Viscosity in Aging Process of High Nitrogen Content Single Base Propellant
Lou Yunjun
Beijing Institute of Technology, Beijing 100081

Abstract: In this paper, the change laws of mass and mass distribution and intrinsic viscosity in aging process of high nitrogen content single base propellant(HNCSBP) were studied by using size exclusion chromatography and capillary viscometer. The results showed that mass and intrinsic viscosity of HNCSBP all have the negative index relationship with aging time respectively. The mathematics formula about mass M and intrinsic viscosity was given. This has some referenced values for the production and the study of stoical properties of HNCSBP.

52. The Improvement of Nitramine CMDB Propellant's Combustion Performance
Bai Guangmei Liang Yumin Zhang Xuzhu Ma Zhongliang
North China Institute of Technology, Taiyuan 030051

Abstract: A new complex energetic combustion catalyst— PNTO/β Cu/TCB is selected to improve the combustion performance of nitramine composite modified double based propellant in this paper. Result indicates that the catalytic effect on the mentioned propellant is very good. Under normal temperture, it makes the pressure exponent reduce to 0.378 in the pressure range 7.8～17.7MPa. While the burning rate rise to 28.32mm/s.

53. A Technology of Making Low Temperature Sensitivity Coated Propellant
Huang Hongyong Wang Zeshan

Abstract: A new technology of making low temperature sensitivity coated propellant was given in this paper by ways of experiment study. Results of experiments of termination combustion and ballistic calculation show that the coated propellant made by the new technology has the same low temperature coefficient as the coated propellant made by conventional roller coating technology, but the product of new technology has more equal quality than the product of old technology. The new technology is worth spreading.

54. The Colligative Property of Glass Transition Temperature and its Sudden Change for HAN H 2O System
Yin Cuimei Liu Ziru Hou Jianping Kong Yanghui
Xi'an Modern Chemiistry Research Institute, 710065

Abstract: The dependence of the glass transition temperature (T g) of binary system of hydroxylammonium nitrate water (HAN H 2O) on the content of H 2O has been investigated by DSC. It was found that T g of the binary system exhibits the colligative property in the concentration range of 25 82 mol% HAN and when HAN concentration is decreased as low as 25 mol%, the property disappears and the T g rises surprisingly and is concentration independent. An attempt have been made to interpret this behaviour in terms of the molecular clusters formed by various mole ratios of HAN/H 2O which change with the content of H 2O in the system. It is considered that at most three moleculae of H 2O can be incorporated with one HAN to form into the cluster, but when the content of H 2O inceases as high as 75 mol % (the mole ratio of HAN/H 2O is 1/3), only cluster of 2/3 mole ratio of HAN/H 2O is formed and is the most stable.

55. Ecologically Safe Bismuth containing Catalysts for solid Rocket Propellants
Zhao Fengqi Li Shangwen Cai Bingyuan
Xi'an Modern Chemistry Research Institute, Xi'an 710065

Abstract: The effect of ecologically safe bismuth contaning catalysts on the combustion behavior of DB/RDX CMDB propellants is reviewed in present paper. The burning rate catalysis of bismuth derivatives and lead compounds is analysed and compared. The results show the high hispersed bismuth derivatives can be used in DB/CMDB propellants instead of lead compounds with ecologically less safety.

56. The effect of C 60 on the pyrolysis of NC、RDX
Li Shufen He Deqiu
China Univ. of Science and Technology, Hefei 230026

Abstract: The influences of C 60 , soots containing 10% C 60 and carbon black on the pyrolysis of NC and RDX were studied by DSC experiment. It is found that these three substances can increase calorific value of NC、RDX pyrolysis in different degrees. Especially, rich charge characteristic of fullerene molecules is beneficial to the activation of lead salt catalyst, C 60 and element lead may be form a complex which not only is catalytic carrier, but also has fine catalysis in gas reaction.

57. The phase transition and phase diagram of the HAN TEAN H 2O ternary system
Liu Ziru Hou Jianping Yin Cuimei Kong Yanghui
Xian Mordern Chemistry Research Institute, 710065

Abstract: The low temperature behaviour of the ternary system has been investigated by DSC and a phase diagram for correlation of the phase transition with the composition was constructed. The changes of glass transition of the system with HAN/TEAN ratio have been observed. It is found that the property of solution of the ternary system is similar to that of the binary system of HAN H 2O for the higher ratio of HAN/TEAN and the property to that of the binary system of TEAN H 2O for the low ratio of HAN/TEAN.

58. Experimental Study on Thermodynamics of Gas Generating Agent with Sodium Azide
Huang Yinsheng Dai Shizhi Shen Ruiqi Ye Yinghua
Nanjing University of Science and Technology, 210094

Abstract: By DSC thermal analysis method, the thermodynamics characteristics of gas generating agent with Sodium Azide have been researched, and the chemical reaction performance varying with the compositions is obtained.

59. The Miscibility of Ethylene Oxide—Tetrahydrofuran Copolyether in Nitrates
Tian Lin Xi'an g
College of chemical Engineering and Material Science, Beijing Institute of Technology, 100081

Abstract: The effects of quantities of ion solubilizing reagent(ISR)on miscibility of THF and ethylene oxide co polyether P(E-CO-T) with nitroglycerin(NG). Nitroglycerin content in miscible phase was determined byrevesed phase high performance Liquid Chromatography. The miscibility Limits of P(E-CO-T)/NG, P(E-CO-T)/NG+BTTN sytems at ambient and negative temperatures in the presence of ISR were investigated. The solubilization of the systems was explored by FTIR. The results of this research show that the addition of ISR obviously increase the miscibility between P(E-O-T)and nitrates.

60. The Glass Transition Temperature and the Activation Enthalpy of Volume Relaxation of Liquid Gun Propellants
Liu Ziru Yin Cuimei Hou Jianping
Xi'an Modern Chemistry Research Institute, 710065 [KH+3mmD]

Abstract: The glass transition temperatures (T g) of three liquid gun propellants (LGP) of the ternary system of hydroxylammonium nitrate triethanolammonium nitrate water (HAN TEAN H 2O) have been measured and the dependence of T g on heating rate has been investigated by means of DSC. An equation for the activation enthalpy of volume relaxation at glass transition was derived and its activation enthalpy was calculated, resulting in an improvement on the method of prediction of viscosity for LGP at low temperature.

61. The Activation Enthalpies of Viscous flow and the Estimation of Viscosity at low Temperature for Liquid Gun Propellants
Hou Jianping Liu Ziru Yin Cuimei
Xi'an Modern Chemistry Research Institute, 710065

Abstract: The viscosities for three liquid gun propellants (LGP) at various temperature have been determined, the dependence of their activation enthalpies of viscous flow on temperature has been investigated and the activation enthalpies have also been calculated. The parameters of Andre′s equation were modified and a new method used to estimate the viscosity of LGP at low temperature was developed by way of the combination of the activation enthalpies of viscous flow with those of glass transition. The results show that this method is more accurate than fitted VTF Equation for the estimation of viscosity of LGP at low temperature.

62. Synergistic interaction between AP and HMX
Chong Fanga; Shufen Lia [ aDepartment of Chemical Physics, University of Science and Technology of China, Hefei, People’s Republic of China], Journal of Energetic Materials, Volume 20, Issue 4 2002, pages 329 - 344

Abstract: Based on the condensed-phase mechanism and thermolysis experimental results, the synergistic interactions between AP and HMX in NEPE propellants are studied from the two viewpoints of molecular structure and chemical reaction. Related to bond polarity, formal charges, chain reaction theory and the systematic comparison of solid monopropellant combustion and modeling, the “linkage-mutualism” mechanism is proposed. That implies between AP and HMX, the heat released is interlocked while the species produced are mixed and reacting with each other in the combustion wave. AP content and particle size can influence the mechanism; therefore will have significant effects on the ignition and combustion characteristics of NEPE propellants.

63. Characteristics of Dust Explosion of AP/HTPB/Ferrocene Mixed System
YU Hong-tao, ZHANG Qing-ming and HE Yuan-hang, Chinese Journal of Energetic Materials, 2009, 17(3):283~286

Abstract: For investigating the ignition mechanism of HTPB propellant under waterjet high pressure，Hartman bomb was used to study the lower limit of explosion density and the minimum ignition energy of the AP/HTPB/ferrocene system，and the effects of AP content，ferrocene content and ambient humidity on the characteristics of dust explosion were analyzed. Results show that with the increasing of AP and ferrocene content，the minimum ignition energy and the lower limit of dust explosion density of the mixed system decrease; with the increasing of ambient humidity (80%-90%)，the minimum ignition energy and the lower limit of explosion density of the mixed system containing ferrocene change gently.

64. Detonation Velocity Deficits of Superfine Desensitized HMX Charged in Curve Limited Channel
LI Xiao-gang, WEN Yu-quan, JIAO Qing-jie and JIA Ning-bo, Chinese Journal of Energetic Materials, 2009, 17(3):312~316

Abstract: In order to study the detonation velocity deficits of superfine desensitized HMX in curve channel，the relation formula between detonation velocity deficits and corner radius were deduced. The detonation velocity deficits of the HMX charged in curve channel were measured. Results show that the empirical formulation is in a good agreement with the semi-empirical formulation.

65. A Simplified Theoretical Model on Scattering and Distribution of Explosive Residue of Solid Condensed Explosive
YI Jian-kun, AI Yun-ping and YAN Ke-bin, Chinese Journal of Energetic Materials, 2009, 17(3):317~320

Abstract: A simplified theoretical model was introduced for predicting distribution characteristic of explosive residue in horizontal orignating from surface layer of charge because of border influence. With the theoretical model of spherical grain dynamics of sparse two-phase flow in single dimension， computing formulas of velocity′s attenuation and scattering distance were built for explosive residue grains in horizontal. Then， a simplified theoretical model on distribution of explosive residue was put forward on the basis of a spherical space with radius equalling to maximum horizontal scattering distance of explosive residue grains with certain diameter. With this model，the distribution characteristics in horizontal of explosive residue grains were theoretically analyzed under condition of explosion in air. Results show that there exists a maximum value of scattering distance in horizontal for explosive residue grains with certain diameter，and the density of mass distribution of explosive residue firstly increases with incraesing of distance to a maximum value and then decreases with inereasing of distance. Theoretical result basically matchs the phenomena of distribution of explosive residue in experiments.