摘要:

AbstractA given formulation of a composite explosive was submitted to accelerated aging at 293 K, 333 K and 353 K for slightly over a year. Extensive determination of mechanical properties were conducted using an Instron Tester to characterize the aging process of the explosive as a whole. The change of elongation at maximum load can be fitted to a third‐order reaction rate giving an enthalpy of activation (Δ Ha) for the aging process of (78 ± 5) kJ/mol. Although the change of stress at maximum load was a function of temperature, it could not be predicted by a simple correlation. Swelling, inverse gas chromatography and N2O evolution by infrared were applied to the samples aged at 333 K. Swelling measurements show a regular increase with aging of the relative number of cross‐linking. Inverse gas chromatography at 373 K in helium indicated a first‐order kinetic aging process for every sample, but the rate constant (k) of the samples aged for 0, 30 and 60 days was slightly lower than the one for samples aged for 130, 250 and 375 days. The N2O evolution measured at 338.5 K in vacuum by infrared absorption indicates an aging process consisting of two consecutive first‐order reactions, the second one being ten times slower than the first one. The first stage, which was also studied by inverse gas chromatography, gives rate constants which are about half as large as those measured by chromatography and confirms the changes in behavior from the samples aged for 0, 30 and 60 days to the samples aged for 130, 250 and 375 days. These results are discussed in relation to an aging process by oxidative cross‐linking of the binder and degradation of the soli

ISSN:0721-3115    

DOI:10.1002/prep.19790040302

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractAmmonium nitrate and ethylenediamine dinitrate in a composite have been determined by potentiometric titration with standard base after reaction with formaldehyde. Ethylenediamine dinitrate yields two breaks, while ammonium nitrate exhibits only a single potentiometric break. Both components can therefore be resolved. The first potentiometric break is a measure of the ethylenediamine dinitrate content, while the second break is a measure of the sum of the components.

ISSN:0721-3115    

DOI:10.1002/prep.19790040303

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractThe heat of decomposition allows the quantitative determination of tetrazene in primer mixtures by DSC or DTA. The standard deviation of the method is 0.02 mg if the content in tetrazene is in the range of 0.1 mg to 1.5 mg. The confidence interval of a measurement is 0.03 mg tetrazene. This is sufficient for control measurements in view of the large variations introduced during sampling of tetrazene in small amounts of primer. The low weight required by the method (2 mg or more) enables the determination of tetrazene in friction compositions of a detonator or in percussion caps. This is important when malfunctions have to be analyzed.

ISSN:0721-3115    

DOI:10.1002/prep.19790040304

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractA simple, empirical linear relationship between detonation velocity at theoretical maximum density and a factor, F, that is dependent solely upon chemical composition and structure is postulated for a gamut of ideal explosives. The explosives ranged from nitroaromatics, cyclic and linear nitramines, nitrate esters and nitro‐nitrato aliphatics to zero hydrogen explosives, carbonless explosives and hydrogen rich explosives. Of the 64 explosives evaluated, 95% had calculated detonation velocity values within 5% of experimental and 98% within 7%. Only nitromethan varied grossly (−; 13%) from calculated velocity and the absolute error for all explosives is ±

ISSN:0721-3115    

DOI:10.1002/prep.19790040305

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractOn étudie l'influence des interactions cristallines sur les paramètres moléculaires corrélés à la sensibilité au choc lors de précédents travaux. Les résultats obtenus permettent de mieux préciser les rǒles respectifs de la molécule et du cristal lors de l'initiation de la détonation. Ils montrent que dans ce domaine, les conclusions tirées de calculs effectués sur une molécule isolée dans sa conformation cristalline sont valables pour

ISSN:0721-3115    

DOI:10.1002/prep.19790040306

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19790040307

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19790040301

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY