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| Description
| - 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 consisting of 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 storage at 25°C. Molar mass distributions of aged NC were determined by size-exclusion chromatography. Mechanical properties of DB propellant were investigated by dynamical mechanical analysis and uniaxial compression and tensile tests. From the results we obtained activation energies of scission of NC chain in investigated temperature interval 85 kJ.mol-1 and 105 kJ.mol-1. We also analysed relationship between changes of average molar mass and surveyed mechanical properties.
- 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 consisting of 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 storage at 25°C. Molar mass distributions of aged NC were determined by size-exclusion chromatography. Mechanical properties of DB propellant were investigated by dynamical mechanical analysis and uniaxial compression and tensile tests. From the results we obtained activation energies of scission of NC chain in investigated temperature interval 85 kJ.mol-1 and 105 kJ.mol-1. We also analysed relationship between changes of average molar mass and surveyed mechanical properties. (en)
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| Title
| - Changes of chemical and mechanical properties of double base propellants over artificial ageing
- Changes of chemical and mechanical properties of double base propellants over artificial ageing (en)
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| skos:prefLabel
| - Changes of chemical and mechanical properties of double base propellants over artificial ageing
- Changes of chemical and mechanical properties of double base propellants over artificial ageing (en)
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| skos:notation
| - RIV/60162694:G43__/13:00492704!RIV14-MPO-G43_____
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/60162694:G43__/13:00492704
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - double base propellant; artificial ageing; nitrocellulose; weight average molar mass; size-exclusion chromatography (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...v/mistoKonaniAkce
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| http://linked.open...i/riv/mistoVydani
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| http://linked.open...i/riv/nazevZdroje
| - Proceedings of 16th seminar on New Trends in Research of Energetic Materials
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
| - Konečný, Pavel
- Krejčíř, František
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| http://linked.open...vavai/riv/typAkce
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| http://linked.open.../riv/zahajeniAkce
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| number of pages
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| http://purl.org/ne...btex#hasPublisher
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| https://schema.org/isbn
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| http://localhost/t...ganizacniJednotka
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