Enhanced Reactivity of Aluminum Powders by Capping with a Modified Glycidyl Azide Polymer

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Authors
  1. Pontes Lima, R.J.
  2. Dubois, C.
  3. Stowe, R.
  4. Ringuette, S.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Ecole Polytechnique, Montreal QUE (CAN)
Abstract
Aluminum powder is a significant component of many energetic formulations for rocket propellants and explosives due to its high combustion enthalpy on both a mass and volumetric basis. The combustion properties of these formulations can be enhanced further through the use of aluminum nanoparticles including shorter ignition delay, shorter burning time, and more complete combustion. High-energy ball milling was used as a method to produce aluminum-functionalized nanoparticles. This method is based on the reaction of the new metallic surface generated by grinding with an organic functionalized compound. In order to enhance the reactivity of aluminum powders coated by organic layers, we replaced the organic functionalized compound with an energetic polymer—glycidyl azide polymer (GAP). To achieve a desirable reactivity of GAP with aluminum particles, GAP plasticizer has been chemically modified by the partial reactions of azide groups on the polymer chain. The modified GAP (GAPm) was grafted onto the aluminum particles by the reactions of acid groups and aluminum in a simultaneous reaction milling. The aluminum particles coated with GAPm were characterized by the Brunauer–Emmett–Teller surface area analysis technique and scanning electron microscopy. Thermal gravimetric and differential thermal analyses were also used to carry out a study on the reactivity of the coated powders. Several different formulations of these coated powders combined with a binder were produced to
Keywords
reactive milling;aluminum;GAP;nanoparticles
Report Number
DRDC-RDDC-2017-P075 — External Literature
Date of publication
01 Sep 2017
Number of Pages
24
Reprinted from
International Journal of Energetic Materials and Chemical Propulsion, 15 (6): 481 500 (2016)
DSTKIM No
CA045421
CANDIS No
805828
Format(s):
Electronic Document(PDF)

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