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1 Central European Journal of Energetic Materials

1 2007

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Quantitative Infra-Red Microscopy Method for the Determination of the Deterrent Diffusion Activation Energy in a Spherical Propellant

Jeunieau L., Lefebvre M. H., Guillaume P.

Central European Journal of Energetic Materials

2007

Vol. 4, nr 1-2

109-124

A calibration procedure for quantitative determination of dibutylphthalate concentration in a double base propellant is established. The best results are obtained by dividing an absorption band, characteristic of the dibutylphthalate, by an absorption band characteristic of the double base mixture. The influence of the nitroglycerin concentration on the linear calibration curve is investigated and it is shown that a linear relationship can be obtained for different concentrations of nitroglycerin by multiplying the absorbance ratio by the nitrocellulose concentration. The developed analysis protocol is applied to characterize quantitatively the deterrent concentration profile of a flattened ball propellant. Since the measured profile in a given propellant grain is dependent of the orientation of the analysed cross-section, geometrical and concentration factors are used to eventually describe the profile perpendicularly to the grain surface. The validated experimental procedure is then applied to study the characteristic of the diffusion process of the deterrent throughout the grain by artificial ageing at different temperatures. From these results, diffusion coefficients and diffusion activation energy of 154 ± 15 kJ/mol have been obtained. Furthermore, a simulation program has been used to validate the used procedure for the calculation of the diffusion coefficient.