No abstract

No abstract

As part of a program to develop chemical tests which can be used to complement existing tests for mechanical properties, propellant ballistic performance, and explosive sensitivity, a detailed experimental procedure is presented for analysis of plastic‐bonded explosives (PBX's) by the coupled method of pyrolysis‐gas chromatography (PyGC). The method involves grinding the cooled PBX, pressing a controlled quantity on a pyrolysis wire, performing Curic‐Point pyrolysis, and detecting the products after separation by gas chromatography. PyGC results are presented to show the capability of the method to differentiate aged and unaged samples of PBX's and to differentiate stabilized and unstabilized PBX's based on RDX. Also included are results from several series of reproductibility studies, which suggest that the method may require only minor modifications before it can be implemented for regular screening of these complex formulations.

LCNS-Untersuchungen von mitEthylcentralit stabilisierten Treibladungspulvern Aus einer Serie von gealterten Rohrwaffen-und Morsertreibladungspulvern wurde der Stabilisator Ethylcentralit extrahicrt und die Extrakte durch Kombination von Hochleistungsfliissigchromatographie und Massenspektrometrie (LCIMS) untersucht. Die HPLC-Retentionszeiten und die Massenspektren hei chemischer Tonisation erlaubten die Identifikation einzelner Produkte und rnachten es moglich, Konzentrationsprofile als Funktion der Alterungszeit zu erstellen. Diese Ergebnisse sind nutzlich bei der Anwendung moderner Methoden fur das Ubenvachungsprogramm der Stabilitit von Rohrwaffen-und Morsertrcibladungspulvern.Analyse par chromatographie en phase liquide et par spectrometrie de masse de propergols stabilises par de I'ethyle-centralite Sur une sCrie de poudres pour munitions de canons et de mortiers, presentant un certain vieillissement. on a procede h I'extraction du stabilisateur, constitub par de 1'6thyle-centralite, pour le sournettre h une analyse combinee par chromatographie en phase liquide B haute performance et par spectromttrie de masse. A partir dcs dukes de rCtention dans le chromatographe et des spectres enregistres apri.s ionisation chimique, les differents composants ont pu &tre identifies et leurs profils de concentration determines en fonction de la durte de vieillissement. Les rksultats obtenus seront utilises dans des mCthodes rnodernes de surveillance de la stabilitC des propergols pour munitions de canons et de mortiers. SummaryExtracts of the stabilizer ethyl centralite and its derivatives in a series of aged gun and mortar propellants were investigated by combined high performance liquid chromatographyimass spectrometry (LCIMS). The HPLC retention times and the chemical ionization mass spectra obtained allowed positive identification of several products and made it possible to construct concentration profiles as a function of aging time. These results are useful for implementation of modern methods into stability surveillance programs for gun and mortar propellants.