Bomb Calorimetric Study of a Series of Energetic Linear Polyphosphazenes

• Autorzy: Bellamy A. J. , Contini A. E. , Golding P. , Trussell S. J.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

energetic polyphosphazenes; heat of combustion; heat of formation

• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2005
• Tom: Vol. 2, nr 4
• Strony: 23--31
• Opis fizyczny: Bibliogr. 16 poz.

Twórcy

autor

Bellamy A. J.

• Cranfield University, Defence Academy of the United Kingdom, Shrivenham, Swindon SN6 8LA, UK

autor

Contini A. E.

• Cranfield University, Defence Academy of the United Kingdom, Shrivenham, Swindon SN6 8LA, UK

autor

Golding P.

• AWE Aldermaston, Reading RG7 4PR, UK

autor

Trussell S. J.

• AWE Aldermaston, Reading RG7 4PR, UK

Bibliografia

• [1] Golding P., Trussell S. J., Energetie Polyphosphazenes - a New Category of Binders for Energetie Fonnulations, Insensitive Munitions & Energetic Materials Technology Symposium, San Francisco, 15-17 November 2004.
• [2] Kirklin D. R, Domalski E. S., Enthalpies ofCombustion of Triphenylphosphine and Triphenylphosphine Oxide, J Chem. Thermodynamics, 1988,20(6), 743-754.
• [3] Ames D. P., Ohashi S., Callis C. F., Wazer Van J. R., Prineiples of Phosphorus Chemistry. IV The System of Fluorophosphorie Aeids, J Amer. Chem. Soc., 1959, 81,6350-6357.
• [4] Good W D.,.Seott D. W, Waddington G., Combustion Calorimetry of Organie Fluorine Compounds by a Rotating-bomb Method, J Phys. Chem., 1959, 60, 1080-1089.
• [5] Cox 1. D., Gundry H. A.and Head A. 1., Thennodynamie Properties of Fluorine Compounds. I. Heats of Combustion of p-FluorobenzoieAeid, Pentafluorobenzoie Aeid, Hexafluorobenzene, and Deeafluoroeyclohexane, Trans.Faraday Soc., 1964, 60,653-665.
• [6] Plakhotnik V N., Shamakova N. N., Tulchinskii V B., Llin E. G., Ignatov M. E., Fonnation Equilibrium of Monofluorophosphorie Aeid, Zhumal Neorgranicheskoi Khimii, 1985, 30(11), 2773-2777.
• [7] Sheluehenko V V, Dubov S. S., Drozd G. I., Ivin S. Z., N.M.R. of Phosphorus 31 and Fluorine-19 of Some Trieoordinated Phosphorus Compounds Containing Phosphorus-fluorine bonds, Zhumal Struktumoi Khimii, 1968,9(5),909-910.
• [8] Vast P., Semmoud A., Addou A. Palavit G., New method for preparation of difluorophosphorie aeid, J Fluorine Chem., 1985,27(3),319-325.
• [9] Nixon 1. F., Sehmutzler R., Phosphorus-31 Nuclear Magnetie Resonanee Studies of Phosphorus-fluorine Compounds, Spectrochim. Acta, 1964, 20(12), 1835-1842.
• [10] Bedford A. F., Mortimer C. T, Heats ofFonnation and Bond Energies. II. Triethyl Phosphate, Triphenylphosphine, and Triphenylphosphine Oxide, J Chem. Soc. (Abstraets), 1988,20,743-754.
• [11] Roux M. V, Torres T A., Davalos J. Z., 1,2,4- Triazole as a Referenee Material for Combustion Calorimetry of N-eontaining Compounds, J Chem. Thermodynamics, 2000,33, 949-957.
• [12] Larson J. W., Su B., Thennodynamies of Fonnation of Aqueous Monoftuoro-,Difluoro- and Amidofluoro-phosphorie aeids, J Chem. & Eng. Data, 1994, 39( 1), 36-38.
• [13] Washbum E. M., Standard States for Bomb Calorimetry, Bur. Standard s J Research, 1933, 10, 525-528.
• [14] Diaz E., Brusseau P., Ampleman G., Prudhomrne RE., Heats of Combustion and Fonnation of New Energetie Thermoplastie Elastomers Based on GAP, PolyNIMMO and PolyGLYN, Propellants, Explos., Pyrotech., 2003, 28(3), 101-106.
• [15] Lias S. G., Bartmess J. E., Liebman 1. F, Holmes J. L., Levin R D., Mallard W G., Gas-phase lon and Neutral Thennoehemistry, J Physical & Chemical Reference Data, Supplement, 1988, 17(1).
• [16] Contineanu I., Marehidan D. I., The Enthalpies of Combustion and Fonnation of Some Isomers ofAminobutanoie acid, Revue Romaine de Chimie, 1994,39(12), 1391-1395.