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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN 印刷: 2150-766X
ISSN オンライン: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v7.i3.10
pages 171-185

BEHAVIOR OF HYDROXYL-TERMINATED POLYETHER (HTPE) COMPOSITE ROCKET PROPELLANTS IN SLOW COOK-OFF

Rodrigo I. Caro
Department of Research, Innovation and Development, Fábricas y Maestranzas del Ejército de Chile, Chile
John M. Bellerby
Department of Applied Science, Security and Resilience, Cranfield University Defense Academy, Shrivenham, Swindon SN6 8LA

要約

In order to try and understand the behavior of a hydroxyl-terminated polyether (HTPE) propellant in slow cook-off and to compare it with a similar HTPB (hydroxyl-terminated polybutadiene)-based composition, a co-polyether pre-polymer was synthesized. Two kinds of HTPE composite propellant plasticized with n-BuNENA, containing either ammonium perchlorate (AP) as oxidant or a mixture of AP and phase-stabilized ammonium nitrate (PSAN) were manufactured. Antioxidants were not included in the formulations. The two kinds of HTPE propellant were cured inside small-scale slow cook-off test vehicles (SCTV). The SCVT were heated slowly in accordance with the STANAG 4382 criteria for slow cook-off. The thermal decomposition behavior of HTPE and HTPB binder networks, gumstocks, and propellant samples were also investigated by differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, and size exclusion chromatography (SEC). Both kinds of HTPE propellant behaved in a different way to that reported in previous studies, although for HTPE propellants containing only AP as oxidizer, no published information has been found. In fact, the ignition temperature for the HTPE/AP/n-BuNENA and HTPE/PSAN/n-BuNENA compositions were observed at around 180°C and 215°C, respectively, and the HTPE propellant composition containing PSAN as oxidizer gave a more violent response than the HTPB composition. It was observed that while the HTPB propellant became hard and brittle during slow heating, both kinds of HTPE propellant became softer, with the sample containing PSAN as co-oxidizer having the greatest degree of softness. It is believed that the softening and even liquefaction of the organic phase in HTPE propellants has an important influence on the slow cook-off response, especially if the surface area at the ignition time is taken into account as a factor in the response to slow cook-off.

参考

  1. Comfort, T.F., Dillman, L.G., Hartman, K.O., Magnum, M.G., and Steckman, R.M., (1994) Insensitive HTPE Propellants.

  2. Comfort, T.F., Dillman, L.G., Hartman, K.O., Magnum, M.G., and Steckman, R.M., (1996) Insensitive HTPE Propellants.

  3. Parr, T.P and Hanson-Parr, D.M., Flame Structure Studies of AP/HTPE and AP+AN/HTPE Propellants.

  4. Kudva, G.N. and Litzinger, T.A., Low-Pressure Laser and Pressure-Driven Response Measurements on AP/HTPE and AP+AN/HTPE Propellants.

  5. Caro R.I., Bellerby J.M., and Kronfli, E., Characterisation and Thermal Decomposition Studies of Hydroxy Terminated Polyether (HTPE) Copolymer and Binder for Composite Rocket Propellants.

  6. Caro, R.I., Bellerby J.M., and Kronfli, E., Synthesis and Characterisation of a Hydroxy Terminated Polyether (HTPE) Copolymer and Binder for Composite Rocket Propellants.

  7. Caro, R.I., Bellerby, J.M., and Kronfli, E., Synthesis and Characterisation of a Hydroxy Terminated Polyether (HTPE) Copolymer for Use as a Binder in Composite Rocket Propellants.

  8. Frota, O., Development of a Low Cost Cook-Off Test for Assessing the Hazard of Explosives.

  9. Matei, M.V., Study of Cook-Off in One Dimensional Time to Explosion Apparatus.

  10. Komai, I. and Sato, W., Reaction Mechanism in Slow Cook-off Tests of GAP/AP Propellants.

  11. Chase, M. and Thorp, G.P., Solid Rocket Case Design.

  12. Chan, M.L. and Turner A.D., Insensitive High-Energy Booster Propellant Suitable for High-Pressure Operation.

  13. Atwood, A.I., Rattanapote, M.K., and Curran, P.O., Feasibility for Development of an Alternate Test Protocol to the Full-Scale External Fire Test Used in Hazards Classification.

  14. Hartman, K.O., Insensitive Munitions Technology for Small Rocket Motors.


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