Changes of chemical and mechanical properties of double base propellants over artificial ageing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60162694%3AG43__%2F13%3A00492704" target="_blank" >RIV/60162694:G43__/13:00492704 - isvavai.cz</a>

Výsledek na webu

<a href="http://vavtest.unob.cz/registr" target="_blank" >http://vavtest.unob.cz/registr</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Changes of chemical and mechanical properties of double base propellants over artificial ageing

Popis výsledku v původním jazyce

Solid propellants are the part of an armament that is most liable to ageing processes. The most remarkable factor of ageing of double-base propellants (DB propellants) is temperature whereas increase of temperature by 10 °C causes around 2.9 times increase of the rate of chemical decomposition and the main role in the ageing act nitrocellulose (NC). Over ageing are not only split off radicals NO2 even at room temperature due to low activation energy of O-NO2 bond, but also cut chains of NC which means reducing of average molar mass. The lowering of average molar mass of linear polymer leads to lowering mechanical strength and to changes in other mechanical properties. The paper shows results of an experiment that was performed on propellants consistingof nitrocellulose, nitroglycerin and dinitrotoluen (DNT) and its alternative with replaced DNT by other plasticizer. Grains of propellants were artificially aged at 65 °C and 80 °C for a period corresponding to 5, 10, 15 and 20 years of

Název v anglickém jazyce

Changes of chemical and mechanical properties of double base propellants over artificial ageing

Popis výsledku anglicky

Solid propellants are the part of an armament that is most liable to ageing processes. The most remarkable factor of ageing of double-base propellants (DB propellants) is temperature whereas increase of temperature by 10 °C causes around 2.9 times increase of the rate of chemical decomposition and the main role in the ageing act nitrocellulose (NC). Over ageing are not only split off radicals NO2 even at room temperature due to low activation energy of O-NO2 bond, but also cut chains of NC which means reducing of average molar mass. The lowering of average molar mass of linear polymer leads to lowering mechanical strength and to changes in other mechanical properties. The paper shows results of an experiment that was performed on propellants consistingof nitrocellulose, nitroglycerin and dinitrotoluen (DNT) and its alternative with replaced DNT by other plasticizer. Grains of propellants were artificially aged at 65 °C and 80 °C for a period corresponding to 5, 10, 15 and 20 years of

Druh

D - Stať ve sborníku

CEP obor

KA - Vojenství

OECD FORD obor

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Projekt

<a href="/cs/project/FR-TI4%2F290" target="_blank" >FR-TI4/290: *Tuhé pohonné hmoty s limitními rychlostmi hoření</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of 16th seminar on New Trends in Research of Energetic Materials

ISBN

978-80-7395-605-9

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

208-215

Název nakladatele

University of Pardubice

Místo vydání

Pardubice

Místo konání akce

Pardubice

Datum konání akce

1. 1. 2013

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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