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2017, vol. 67, iss. 2, pp. 13-19
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Analysis of the of propellants-polymers compatibility by different test methods
Analiza hemijske kompatibilnosti baruta i polimernih materijala primenom različitih metoda ispitivanja
Abstract
This paper shows the results of chemical compatibility of two types of propellants (NGB-051and NC-28) with two types of polymer materials (Polyamide 12 and Polymethylmetacrylate) by different test methods. Testing was performed using heat flow calorimetry, differential scanning calorimetry, the method of chemical analysis after aging and vacuum stability test method according to STANAG 4147. The heat flow curves of propellants, polymeric materials and their mixtures and the theoretical curves were determined. Produced energy was calculated and the values of relative and absolute compatibility were determined. Analysis of the exothermic peak of decomposition of propellants and its mixture with polymer materials was performed and the maximum difference in peak temperatures was calculated. The stabilizer content of the unheated propellants, the artificially aged propellants and the propellants after heating in contact with the polymer material was determined. The values of the volume of released gas, by using vacuum stability test method, for the propellants and polymer materials as well as their mixtures were determined. The value of absolute compatibility was calculated. Compatibility was estimated on the basis of the results presented.
Sažetak
U ovom radu su prikazani rezultati ispitivanja hemijske kompatibilnosti jednobaznog i dvobaznog baruta (NGB-051 i NC-28) sa dva različita tipa polimernih materijala (Poliamid 12 i Polimetilmetakrilat) korišćenjem različitih metoda ispitivanja. Ispitivanja su izvršena sledećim metodama: metodom mikrokalorimetrije, metodom diferencijalne skenirajuće kalorimetrije, metodom hemijske analize posle starenje i metodom vakuum-test stabilnosti. Određene su krive toplotnog protoka za barute i polimerne materijale, njihove mešavine, kao i teoretske krive. Izračunata je oslobođena energija i određene vrednosti relativne i apsolutne kompatibilnosti. Izvršena je analiza egzotermnih pikova dekompozicije baruta i njihovih mešavina sa polimernim materijalima i izračunata razlika u temperaturama maksimuma pikova. Određen je sadržaj stabilizatora u uzorcima nestarenih i starenih baruta i starenih mešavina baruta sa polimernim materijalima. Određene su vrednosti zapremine oslobođenih gasova za barute i polimerne materijale kao i za njihove mešavine. Izračunate su vrednosti apsolutne kompatibilnosti. Na osnovu svih prikazanih rezultata izvršena je ocena kompatibilnosti.
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