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Polymer-Coated Ultra-Fine Particles

Published online by Cambridge University Press:  26 February 2011

Patrick Brousseau  and
Charles Dubois
Patrick Brousseau
Affiliation:
[email protected], DRDC Valcartier, 2459 Pie-XI blvd North, Val-Belair, Quebec, G3J 1X5, Canada, 418-844-4000 x4274, 418-844-4155
Charles Dubois
Affiliation:
[email protected], Ecole Polytechnique de Montreal, Chemical Engineering, Canada
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Abstract

Ultra-fine metallic particles have demonstrated recently their potential in tailoring the performance of energetic materials. DRDC Valcartier has explored methods to create controllable nanometric coatings on metallic particles and has opted to use polymers to treat the particles. Those coatings can have multiple positive effects. For example, in the case of aluminium, small particles are very reactive and tend to cause interations with the surrounding media. One example is the ageing of aluminium nanoparticles in the presence of air and humidity. Ultra-fine particles age much faster than micron-size particles. The long-term stability of energetic material mixes containing ultra-fine particles will be affected by this reactivity, and coatings would help to solve this problem. Another example is the interaction of aluminium nanoparticles with nitramines that causes gassing. Three coating methods will be presented: by thermoplastics using a Ziegler-Natta reaction, by thermosets through a polycondensation reaction initiated at the surface of the particles, and in-situ coating of particles by on-line polymerization during the plasma production of powders. The results of coating experiments using those methods will be presented. It will be shown that, for aluminium particles, adequate dispersion is a challenge and affects the results of the coating experiments. To assess the performance of the coating methods, ageing tests were carried out on coated and uncoated nanoparticles. The results of ageing tests with those methods will be presented and compared. It will be shown that the polymer coatings reduce significantly the loss of active metal content during accelerated ageing tests. Since the purpose of the powders is to be used in energetic materials, a study on the rheological effects of the coated particles in polymeric solutions will be presented as well. Coated particles increase the relative viscosity of HTPB-Al solutions by a factor of 100 at low shear rates, but much less with PPG.

Keywords

coatingpolymernanoscale
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 896: Symposium H – Multifunctional Energetic Materials , 2005 , 0896-H02-02
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

1. Kuo, K.K., Risha, G.A., Evans, B.J. and Boyer, E. in Synthesis, Characterization and Properties of Energetic/Reactive Nanomaterials, edited by Armstrong, R., Thadhani, N., Wilson, W., Gilman, J. and Simpson, R., (Mater. Res. Soc. Symp. Proc. 800, Boston, MA, 2003) pp.3–14.Google Scholar
2. Simonenko, V.N., and Zarko, V.E., Proceedings of the 30th International Conference of ICT, Karlsruhe, FRG, 29 June – 2 July 1999, V21.Google Scholar
3. Bashung, B., Grune, D., Licht, H.H., and Samirant, M., Proceedings of the 5th International Symposium on Special Topics in Chemical Propulsion (5-ISICP), Stresa, Italy, 19–22June, 2000.Google Scholar
4. Lessard, P., Beaupré, F., and Brousseau, P., Proceedings of the 32nd International Annual Conference of ICT, Karlsruhe, FRG, 3–6 July 2001, P88.Google Scholar
5. Bui, D.T., Atwood, A., and AtienzaMoore, T.M., Proceedings of the 35nd International Annual Conference of ICT, Karlsruhe, FRG, June 29- 2 July 2004, V27.Google Scholar
6. Son, S.F. in Synthesis, Characterization and Properties of Energetic/Reactive Nanomaterials, edited by Armstrong, R., Thadhani, N., Wilson, W., Gilman, J. and Simpson, R., (Mater. Res. Soc. Symp. Proc. 800, Boston, MA, 2003) pp.161–172.Google Scholar
7. Granier, J.J. and Pantoya, M. in Synthesis, Characterization and Properties of Energetic/Reactive Nanomaterials, edited by Armstrong, R., Thadhani, N., Wilson, W., Gilman, J. and Simpson, R., (Mater. Res. Soc. Symp. Proc. 800, Boston, MA, 2003) pp.173–178.Google Scholar
8. Puszynski, J.A. in Synthesis, Characterization and Properties of Energetic/Reactive Nanomaterials, edited by Armstrong, R., Thadhani, N., Wilson, W., Gilman, J. and Simpson, R., (Mater. Res. Soc. Symp. Proc. 800, Boston, MA, 2003) pp. 223–232.Google Scholar
9. Schaefer, R.A. and Nicolich, S.M., Proceedings of the 36th International Annual Conference of ICT, Karlsruhe, FRG, June 28-July 1, 2005, V9.Google Scholar
10. Cliff, M., Tepper, F., and Lisetsky, V., Proceedings of the 37th AIAA/ASME/SAE/ASEE JPC Conference & Exhibit, Salt Lake City, Utah, 8–11 July 2001.Google Scholar
11. Brousseau, P., Crête, J.P. and Dubois, C. in the Proceedings of the 36th International Annual Conference of ICT, Karlsruhe, FRG, June 28-July 1, 2005, P89.Google Scholar
12. Brousseau, P., Côté, S., Ouellet, N., and Lessard, P., Proceedings of the 25th TTCP WPN/TP-4 Meeting, Energetic Materials and Propulsion Technology Technical Workshop, Salisbury, South Australia, 6–7 April 2000.Google Scholar
13. Jones, D.E.G., Lightfoot, P.D., Fouchard, R.C., Turcotte, A.M., Ridley, W., and Qwok, Q.S.M., Canadian Explosives Research Laboratory Report EXP 2001-16, July 2001.Google Scholar
14. Jouet, J., Warren, A.D., Rosenberg, D.M. and Bellito, V. J. in Synthesis, Characterization and Properties of Energetic/Reactive Nanomaterials, edited by Armstrong, R., Thadhani, N., Wilson, W., Gilman, J. and Simpson, R., (Mater. Res. Soc. Symp. Proc. 800, Boston, MA, 2003) pp.67–78.Google Scholar
15. Roy, C., Dubois, C., Lafleur, P. and Brousseau, P. in Synthesis, Characterization and Properties of Energetic/Reactive Nanomaterials, edited by Armstrong, R., Thadhani, N., Wilson, W., Gilman, J. and Simpson, R., (Mater. Res. Soc. Symp. Proc. 800, Boston, MA, 2003) pp.79–84.Google Scholar
16. Dubois, C., Brousseau, P., Roy, C., and Lafleur, P., Proceedings of the 35nd International Annual Conference of ICT, Karlsruhe, FRG, June 29- 2 July 2004, V12.Google Scholar
17. Mary, B., Dubois, C., Carreau, P.J. and Brousseau, P., submitted to Rheologica Acta, July 2005.Google Scholar