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1

An Investigation of the Extended Storage of Single-base Propellants

Nedkova M., Shishkov P., Varadinova L., Glavchev I.

Central European Journal of Energetic Materials

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2014

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Vol. 11, no. 4

613--624

EN

An investigation of single-base propellants has been conducted. The ageing process during extended storage of single-base propellants (SBP) in nonheated military stores and a heated building has been investigated by elemental analysis. Two or three different absorbencies around the band at 1650 cm-1 were observed by FTIR spectroscopy. In this way, not only the denitration of the propellants was determined, but also cleavage of -O-C- bonds between the glycoside rings in the nitrocellulose macromolecules. The latter process was confirmed by the swelling of the SBP.

2

UV-VIS and FTIR Investigations of Long-Term Aged Explosives. Part 2

Shishkov P., Nedkova M., Atanasova P., Glavchev I.

Central European Journal of Energetic Materials

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2011

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Vol. 8, nr 4

303-310

EN

Samples of long-term aged TD-50 and tetryl were investigated by UV-VIS and FTIR spectroscopy and bands of products of ageing were obtained. A complicated maximum of nitro groups at 1537 cm-1 in the FTIR spectra of long-term aged explosives was obtained, like in the IR spectra of long-term aged single-based propellants. Ageing process was confirmed by the presence of several maxima in UV-VIS and FTIR spectra of aged products and determination of several characteristics of the investigated explosives (shifts Δ ν, differences in absorbances ΔA, differences in values of Δh*1/2). Ageing was connected with decrease of H-bond formation on the base of decrease of content of oxygen and nitro groups in TD-50 and tetryl.

3

Utilization of Waste Nitrocellulose Propellants by Obtaining Porous Materials

Shishkov P., Ganev R., Tzvetkoff T., Glavchev I.

Central European Journal of Energetic Materials

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2011

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Vol. 8, nr 2

93-98

EN

Technology for utilization of waste single and double based propellants by obtaining porous propellants was worked out. The technology contains the preparation of solutions of waste propellants with concentration up to 20%, mixing with additives, forming a liquid layer with determined thickness, evaporation of some amount of the solvent, leaching liquid components with water and draying the porous propellants. The time for evaporation of some amount of the solvent was determined from the results of the rates of evaporation. The investigated additives were 1-butanol, ethylene glycol and polyethylene glycol 400. The porous propellants with specific density from 0.5 to 0.7 g/cm3 and regular distribution of voids of dimensions from 0.1 to 500 žm were obtained.

4

IR spectroscopy characterization of single-base propellants during their natural aging

Ganev R., Glavchev I.

Journal of Technical Physics

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2004

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Vol. 45, no 4

301-308

EN

Single-base propellants stored for more than 50 years were investigated by quantitative IR spectroscopy. The natural aging of the propellants was made in military storehouse for 9, 12, 18, 29, 36, 40, and 51 years. The change in the propellants was characterized by IR spectra. The most suitable absorbances for qualitative IR analysis of -OH and -NO2 groups and of internal standards were determined. The hydrogen bonds formation was characterized by the shift of the bonds the peak width at half-height.