REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

Determination OF compatibility of double base propellant with polymer materials using different test methods

MIRJANA dIMIĆ

Military Technical Institute, Belgrade, mirjanadimicjevtic@gmail.com

Bojana Fidanovski

Military Technical Institute, Belgrade, b.fidanovski@gmail.com

ljiljana jelisavac

Military Technical Institute, Belgrade, jelisavach@yahoo.com

Slaviša stojiljkoviĆ

Technical Overhaul Works, Kragujevac, trzk@trzk.co.rs

Nataša karišik

Military Technical Institute, Belgrade, natasa.karisik@gmail.com

Abstract: Compatibility of double base propellant NGB-051 with two types of polymer materials (Nylon 12 and Polymethylmetacrylate) was determined. Testing was performed using heat flow calorimetry, differential scanning calorimetry, the method of chemical analysis after aging and vacuum stability test method. The heat flow curves of propellant, polymeric materials and their mixtures, and the theoretical curves were determined. Produced energy is calculated and the values of relative and absolute compatibility were determined. Analysis of the exothermic peak of decomposition of propellant and its mixture with polymer materials was performed and the maximum difference in peak temperatures was calculated. The stabilizer content of the unheated propellant, the artificially aged propellant and the propellant after heating in contact with the polymer material was determined. The value of the volume of released gas to the propellant and polymer materials as well as mixtures thereof was determined. The value of absolute compatibility was calculated. Compatibility was done on the basis of the results presented.

Key words: compatibility, heat flow calorimetry, differential scanning calorimetry, the method of chemical analysis, vacuum stability test method, double base propellant, polymer materials.