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1 Central European Journal of Energetic Materials

1 2005

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Bomb Calorimetric Study of a Series of Energetic Linear Polyphosphazenes

100%

Bellamy A. J. , Contini A. E. , Golding P. , Trussell S. J.

tom Vol. 2, nr 4

23-31

Energetic linear polyphosphazenes are of potential interest as novel binders for energetic formulations. However, the presence of phosphorus in these materials renders their combustion chemistry significantly different to that of conventional binders. This paper explores the combustion chemistry of a series of energetic polyphosphazenes. The heat of combustion of each member of the series has been measured by bomb calorimetry, and the water-soluble combustion products have been identified and ąuantified using NMR Spectroscopy and łon Chromatography. Since some of the combustion products are hydrolytically unstable, it was necessary to stabilise the initial combustion product mixtures by using a buffer solution instead of pure water in the bomb, and then to determine the composition of the stabilized product mixtures in order to obtain meaningful values for the heats of combustion and thence heats of formation. The thermochemical measurements themselves were made with pure water in the bomb. The composition and structures of the various polyphosphazenes have been correlated with their heats of combustion and should enable polyphosphazenes with specific thermochemical properties to be identified. The 'combustion' of the polyphosphazenes under a nitrogen atmosphere has also been studied.