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Role of aluminum-magnesium alloys in humid aging of composite solid propellants

Deevi, Sarojini and Kishore, K and Verneker, Pai VR (1989) Role of aluminum-magnesium alloys in humid aging of composite solid propellants. In: Journal of Propulsion and Power, 5 (4). pp. 411-420.

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The humid aging of composite propellants containing a terpolymer of polybutadiene, acrylic acid, and acrylonitrile (PBAN) as a binder has been studied as a function of aging temperature, relative humidity, and aging time. Three composite types - AP-PBAN, AP-Al-PBAN, and AP-(Al-Mg) alloy- PBAN - have been studied. The burning rates of all three propellant types were unaffected by aging. The calorimetric values of composites containing aluminum-magnesium alloy decreased on aging, and the lattice parameter of the alloy decreased to a value close to that of aluminum. Water absorption in all of the samples increased with increases in the temperature, relative humidity, and aging time. The compression strength of the nonmetalized and aluminized samples decreased on aging, whereas that of the composites containing the alloy increased. The latter effect has been traced to reaction of residual carboxyl groups on the polymer chains with magnesium, leading to cross-linking. The reaction between the -COOH groups and magnesium has been proved using infrared spectroscopy. (Author)

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Aeronautics and Astronautics.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Ms Mary Ranjeetha
Date Deposited: 11 Aug 2010 10:58
Last Modified: 11 Aug 2010 10:58
URI: http://eprints.iisc.ac.in/id/eprint/31249

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