摘要:

AbstractThe crystal structures of two potentially useful cyanonitramines are reported. Bis(cyanomethyl)nitramine (BCMN), (NCCH2)2NNO2: monoclinic, C2, a = 10.247(1), b = 7.771(1), c = 12.230(2) [Å], β = 107.45 (2)°, Z = 6, Dcalc= 1.502 g.cm−3, RF= 2.8%, RwF= 3.1%. A syn (C2) and anti (Cs) isomers of BCMN crystallize together in a 2:1 ratio in the unit cell. Bis(cyanoethyl)nitramine (BCEN), (NCCH2CH2)NNO2: monoclinic, P21/c, a = 7.512(2), b = 10.840(3), c = 10.181(3) [Å], β = 97.39(2)°, Z = 4, Dcale= 1.357 g.cm−3, RF= 4.6%, RwF= 4.7%. Only one conformation of the BCEN molecule having no symmetry is present in the unit cell. The IR spectrum shows that BCEN forms an amorphous phase when the melt is cooled or when an acetone or acetonitrile solution is rapidly evaporated. The amorphous phase slowly crystallizes at room temperature. High‐rate thermolysis of BCMN liberates NO2as the predominant initial product. This difference is qualitatively predictable on the basis of the variation in the N‐N bond distance in these

ISSN:0721-3115    

DOI:10.1002/prep.19870120102

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19870120110

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

摘要:

AbstractDetailed combustion studies in high‐pressure bombs show that the measured maximum gas pressures are always lower than theoretically calculated values and that these differences increase more than proportionally with rising loading densities. By means of experiments and calculations we show that a considerable part of the pressure difference is brought about by the expansion of the combustion chamber during pressure load.The expansion of the combustion chamber is responsible for pressure measurements that are about 5% too low at currently used pressures of 500 MPa. Furthermore the covolume yields an error of about 12% if the constants of the Abel state equation are determined using the standardized method for loading densities of 0.20 g/cm3and 0.22 g/cm3. The error of the force constant remains under 1%.As the values determined from pressure bomb measurements are to be introduced into further calculations, they must be corrected according to the combustion chamber expansion, or new measuring methods will be necessar

ISSN:0721-3115    

DOI:10.1002/prep.19870120103

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

摘要:

AbstractThe effect of certain lead and copper salts of organic acids and metallic oxides was studied on the burning rates and heat of explosion of CMDB propellants containing AP. Among lead and copper salts, basic lead salicylate gave increased burning rates, whereas lead methylene disalicylate and basic copper salicylate did not produce catalytic effect. In the case of metallic oxides, ferric oxide and cobalt oxide gave better catalytic activity than copper and chromium oxides. On crosslinking of nitrocellulose with an isocyanate, catalytic activity of ballistic modifiers was reduced. Burning rates obtained in a rocket motor (2‐kg propellant) were higher by about 15%‐20% than by strand burner (Crawford Bomb) met

ISSN:0721-3115    

DOI:10.1002/prep.19870120104

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

摘要:

AbstractA safer and more efficient method of mixing, granulating and drying (MIGRAD) highly energetic (UN 1.1) pyrotechnic composition will be reported. The process uses a MIGRAD mixer/granulator that was tailored to mix, granulate and dry a pyrotechnic material (20‐40 lb) within a single mixing chamber. Features of the process include remote loading and unloading, reduced solvent, shortened mixing cycle (40 min), infinitely variable speed control of mixing and granulating impellers, built‐in state‐of‐the‐art fire detection/suppression (UV‐50 ms, IR‐10 ms), explosion venting, heated‐chamber, vacuum drying, remote/programmable controls, and remote mixer cleanup using energy of the mixer. The mixing process will be evaluated for preparation of some 24 pyrotechnic compositions for five Arsenals/Ammo Loading Plants. Hazards Classification Safety Data Sheets were prepared for the 24 pyrotechnic compositions and will be reported along with resultant physical properties of the complet

ISSN:0721-3115    

DOI:10.1002/prep.19870120105

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

摘要:

AbstractThe retentions of 11 explosives on two commercially RP‐18 and Si 100 stationary phases and one prepared 3‐[9′‐(10′‐methylanthryl)]‐ propylsilane stationary phase (MAPS‐phase) were examined by modified mobile phases. The evaluation of these three stationary phases results as follows:(1)Most explosives were effectively separated on a column of MAPS‐phase not only with methanol/water (75/25‐85/15) as mobile phase but also with n‐hexane/dichloromethane (75/25) as mobile phase.(2)Few explosives were effectively separated on a column of RP‐18 with methanol/water (75/25‐85/15) as mobile phase.(3)The separation of most explosives on Si 100 was achieved only under normal phase condition such as n‐hexane/dichlorometh

ISSN:0721-3115    

DOI:10.1002/prep.19870120106

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19870120107

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19870120109

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19870120101

出版商:WILEY‐VCH Verlag GmbH    

年代:1987

数据来源: WILEY