Vojnotehnički Glasnik (Nov 2004)
Kinetički model hemijskih transformacija stabilizatora u jednobaznim barutima / Kinetic model of stabilizer chemical transformations in single base gun propellants
Abstract
U članku je prikazano istraživanje i uspešno verifikovanje kinetičkog modela hemijskih transformacija stabilizatora (difenilamina, DFA) u jednobaznim barutima. Ovaj model pretpostavlja da do hemijske transformacije stabilizatora u barutu dolazi na tri uporedna načina, od kojih svaki predstavlja složenu reakciju, čija se kinetika može opisati reakcijama promenljivog reda. Nađeno je da se eksperimentalni podaci veoma dobro procenjuju reakcijom prvog reda pri velikim koncentracijama difenilamina u barutu i reakcijom nultog reda pri malim koncentracijama tokom završnog perioda upotrebljivosti baruta. Određeni su kinetički parametri ovog modela koji omogućava da se predvidi kinetika hemijskih transformacija stabilizatora u jednobaznim barutima na temperaturama uskladištenja, i tako bolje proceni stanje baruta u skladištima i/ili u municiji. Razmatran je mehanizam hemijskih transformacija difenilamina u odnosu na model i proces starenja baruta. / A suitable kinetic model for the chemical transformations of stabilizer (diphenylamine, DPA) in single base gun propellants was investigated and successfully verified. This model assumes that the chemical transformations of stabilizer in single base gun propellants occur in three concurrent steps - each represents a complex reaction, whose kinetics can be described by reactions of shifting order. It was found that the experimental data were well evaluated by a first-order reaction at high concentrations of diphenylamine in the propellant, but by a zero-order reaction at low concentrations during the final phase of the propellant life cycle. The kinetic parameters of this model permitting prediction of chemical transformations of stabilizer in single base gun propellants at storage temperatures, were determined. The mechanism of diphenylamine chemical transformations was discussed with relation to the model and the ageing behavior of these propellants.
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