摘要:

AbstractPar l'utilisation de méthodes analytiques modernes, telles que la résonance paramagnétique électronique, la spectrophotométrie infrarouge avec étude des déplacements de masse, la spectrométrie de masse et la fragmentométrie, combinées avec des analyses de gaz et des couplages chromatographie‐spectrométrie de masse, on a pu mettre en évidence le caractère radicalaire de la décomposition thermolytique de la nitroglycérine, puis proposer une série de réactions secondaires aboutissant aux produits de

ISSN:0721-3115    

DOI:10.1002/prep.19790040402

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractThe increase in temperature by shock‐compression of non‐porous high explosives was calculated by the Walsh‐Christian technique. Extension of this model to porous media enabled us to calculate the increase in temperature of shock compressed porous high explosives at different loading densities. As an example, calculations have been performed for Composition B at different loading densities. The results are disc

ISSN:0721-3115    

DOI:10.1002/prep.19790040403

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractThe problem of crack growth in a nitrocellulose/nitroglycerin propellant has been studied employing a continuum fracture mechanics approach. Values of the stress‐intensity factor, Kc, at the onset of crack propagation have been ascertained and found to be dependent upon both the thickness of the specimen and the test temperature. By proposing that the value of Kcarises from the sum of a plane‐strain and a plane‐stress component a unique failure criterion, which is constant over a wide temperature range, has been identified. Namely, that crack propagation in the propellant occurs when the plane‐stress plastic‐zone at the crack tip attains a crit

ISSN:0721-3115    

DOI:10.1002/prep.19790040404

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

Abstractn‐Hexylcarborane (NHC) is the proposed burning rate modifier for improved propellants to be used in the next generation of missiles. The synthesis of this material requires decaborane‐14, a material that is not commercially available in large quantities now. Therefore, the cost‐effectiveness of synthesized NHC, as it relates directly to the missile cost, depends upon a low‐cost synthesis of decaborane‐14. Laser induced chemistry, a revolutionary new kind of chemistry, offers a much more efficient and less expensive way to synthesize compounds than conventional thermochemistry provides. Using this technique, we have synthesized decaborane‐14 from diborane in high yields and high purity using both CO2and DF laser frequencies. The products are decaborane‐14 formed as white crystals and pentaborane‐9 in the gaseous state; thus, isolation of the decaborane‐14 is a simple chemical engi

ISSN:0721-3115    

DOI:10.1002/prep.19790040405

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

摘要:

AbstractThermal decomposition studies on double‐base propellants have been carried out in air and vacuum using differential scanning calorimetric, thermogravimetric and mass spectrometric techniques. Low temperature (90 °C–170 °C) decomposition seems to involve diffusion controlled process, the mechanism in air and vacuum being different. High temperature (170 °–205 °C) decomposition involves bond

ISSN:0721-3115    

DOI:10.1002/prep.19790040406

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19790040407

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19790040408

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19790040409

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19790040401

出版商:WILEY‐VCH Verlag GmbH    

年代:1979

数据来源: WILEY