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Estimation of Life Assessment of Energetic Materials using Advanced Kinetic Elaboration of HFC Signals. B. Roduit (1) , P. Guillaume (2) , S. Wilker (3) , P. Folly (4) , A. Sarbach (4) , B. Berger (4) , J. Mathieu (4) , M. Ramin (5) , B. Vogelsanger (5)

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  1. Estimation of Life Assessment of Energetic Materials using Advanced Kinetic Elaboration of HFC Signals B. Roduit (1), P. Guillaume (2), S. Wilker (3), P. Folly (4), A. Sarbach (4), B. Berger (4), J. Mathieu (4), M. Ramin (5), B. Vogelsanger (5) (1) AKTS AG, http://www.akts.com, TECHNOArk 3, 3960 Siders, Switzerland (2) PB Clermont s.a., http://www.pbclermont.be, Rue de Clermont 176, 4480 Engis, Belgium (3) Bundeswehr Institute for Materials (WIWEB), Grosses Cent, 53913 Swisttal-Heimerzheim, Germany (4) armasuisse, Science and Technology, http://www.armasuisse.ch, 3602 Thun, Switzerland (5) Nitrochemie Wimmis AG, http://www.nitrochemie.com, 3752 Wimmis, Switzerland ESTAC - 10 22 - 27 August 2010 Rotterdam – The Netherlands www.pbclermont.be www.armasuisse.ch www.akts.com www.bwb.org www.nitrochemie.com

  2. DSC TG • Thepreciseprediction of the degradationof materials CL HPLC HFC

  3. DSC TG • Thepreciseprediction of the degradationof materials CL HPLC HFC

  4. More precisemeasurement of the thermal aging of energetic materials

  5. DSC TG • Thepreciseprediction of the degradationof materials CL HPLC HFC

  6. DSC TG • Thepreciseprediction of the degradationof materials CL HPLC

  7. Experimentally : • Just few temperatures

  8. reaction progress ? 0 % < a < 5 % predictions time 50°C < T < 100°C days < t < months temperature APPLICATION OF HFC The use of HFC enables to gain advanced knowledge on the reaction rate at the early stage of the decomposition experiments T3 T2 T1

  9. Reaction rate Reaction progress Well defined 50°C Because baseline is well defined Well defined 7 years !

  10. Isoconversional methods Uncertainity of thermokinetic analysis : the stages and physico-chemical reaction pathways are generally unknown What do you see below? Young women? Old man? Or both? ? Observed thermal event can be the sum of thermal events created during certain stages of the reaction which are not always known

  11. Isoconversional method Isoconversional methods (model free): Three main modifications of isoconversional method are applied in the literature: - Differential (Friedman) - Integral (Flynn-Ozawa-Wall) - Advanced integral based on non-linear procedure (Vyazovkin) Differential isoconversional method Reaction rate expressed by the Arrhenius equation = Reaction rate at a given reaction progress a is only a function of the temperature A’(a) and E(a) are the pre-exponential factor and apparent activation energy

  12. Ea = 138 kJ/mol Activation energy E as a function of the heat release

  13. THERMAL AGING

  14. THERMAL AGING

  15. Beijing STANAG 2895 A2 (Hot dry)

  16. The assumption that the reaction rate da/dt at a given reaction progress a is only a function of the temperature (differential isoconversional analysis) is acceptable. = It can be applied for a precise life assessment of energetic materials

  17. (a ± 0.1%) very precise predictions long term predictions fast experiments (<10 hours) (>1 year) Conclusion Is it possible ?

  18. (a ± 0.1%) very precise predictions long term predictions fast experiments (<10 hours) (>1 year) Conclusion Is it possible ? If you want to perform fast experiments (DSC) and get long term predictions using thermokinetics do not expect very precise predictions. If you want to perform fast experiments (DSC) and get very precise predictions using thermokinetics do not expect long term predictions. If you want to get long term predictions and expect very precise predictions using thermokinetics do not perform fast experiments (DSC). Do long term HFC experiments instead and perform thermokinetics.

  19. (a ± 0.1%) very precise predictions long term predictions fast experiments (<10 hours) (>1 year) Conclusion Is it possible ?

  20. Acknowledgements Our partners and friends Thank you for your attention For more information: www.akts.com AdvancedKinetics and TechnologySolutions

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