Reactivities of aluminium and aluminium-magnesium alloy powders in polymeric composites |
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Authors: | S Deevi S C Deevi V R Pai Verneker§ |
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Affiliation: | (1) Indian Institute of Science, 560 012 Bangalore, India;(2) Present address: CeraMat Technologies, 23112 Midlothian, Virginia, USA;(3) Present address: Research and Development Center, Philip Morris USA, P.O. Box 26583, 23261 Richmond, USA;(4) Present address: Pai Research Inc., 5202 Westland Boulevard, Baltimore, MD, USA |
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Abstract: | Polymeric compositions containing Al-Mg alloys show higher reactivities, in comparison with similar compositions containing aluminium. This is observed irrespective of the amount of oxidizer, type of oxidizer used, type of polymeric binder, and over a range of the particle sizes of the metal additive. This is evident from the higher calorimetric values obtained for compositions containing the alloy, in comparison to samples containing aluminium. Analysis of the combustion residue shows the increase in calorimetric value to be due to the greater extent of oxidation of the alloy. The interaction between the polymeric binder and the alloy was studied by coating the metal particles with the polymer by a coacervation technique. On ageing in the presence of ammonium perchlorate, cracking of the polymer coating on the alloy was noticed. This was deduced from differential thermal analysis experiments, and confirmed by scanning electron microscopic observations. The increase in stiffness of the coating, leading to cracking, has been traced to the cross-linking of the polymer by magnesium. |
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