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Chemical Explosives: Warhead Ally CHEMICAL EXPLOSIVES: WARHEAD ALLY Onyenekenwa Cyprian Eneh Institute for Development Studies, Enugu Campus, University of Nigeria, Nsukka; Tel.: +234-803-338-7472, E-mail: [email protected], [email protected] Abstract Interactions among humans and international communities result in occasional misunderstanding, which may mature into dispute, quarrel, conflict or war. To secure victory, the warhead may inflict damage on the target enemy, mostly by a transfer of mechanical energy, producing shock wave or lethal fragments. This review examines how the warhead may store this energy in form of chemical explosives, which take advantage of exothermic chemical reactions that release energy. It recommends the discouragement of the production and use of chemical explosives in favour of Green Chemistry. Keywords: explosive materials; exothermic reactions; detonation Introduction In a world, where no man or nation is an If the reaction proceeds slowly, the island, human and international relations are released energy will be dissipated and there indispensable. This is truer for nations in the will be few noticeable effects other than an globalising village, as the entire world has increase in temperature. But, if the reaction become today. Since people have differences proceeds very rapidly, the energy will not be in interests, mental levels and generations, dissipated. Thus, a great quantity of energy misunderstanding frequently occurs. A can be deposited into a relatively small mismanaged misunderstanding matures into a volume. This manifests in a rapid expansion dispute. If not carefully handled, a dispute of hot gases, leading to the explosion of the blossoms into a quarrel. Without a wise relatively small container. This, in turn, management, a quarrel is blown into a creates a shock wave or propels fragments of conflict. And, if not carefully managed, a the shattered container outwards at high conflict breaks into a full-blown war. speed. The fragments may kill or blow down Therefore, misunderstanding needs wise objects, such as houses or bridges (Meyer et management to forestall dispute, quarrel, al, 2007). conflict and full-blown war (Commander, Chemical explosive is a destructive 1972). device against human life and environment Once a war breaks out, victory is (Eneh, 2011 a,b,c,d; Eneh and Agbazue, sought desparately with all strength and tact 2011; Eneh and Agunwamba, 2011). The at the fighter’s disposal. To secure victory, literature on chemical explosives is the main purpose of any warhead is to inflict fragmented and disharmonious. This review damage on the target enemy, mostly by a paper sought to update and harmonise transfer of energy from the former to the resources on the subject. After this brief latter. Typically, the energy is mechanical in introduction, the remainder of the paper is nature and takes the form of a shock wave or structured as follows: the difference between the kinetic energy of fragments, both of chemical explosives and other exothermic which must release a large amount of energy. reactions, chemical explosive materials, Many warheads store this energy in form of classification of explosive materials, barrier chemical explosives, which take advantage of and initiation of explosive reactions, exothermic chemical ractions that release chemical explosives and their uses, and energy (Army Research Office, 1964). implications for development. 31 Eneh, O.C.: Chemical explosives: Warhead ally, Technoscience Review, 3(1&2), Nov., 2012 The difference between chemical produced, then the energy will remain in the explosives and other exothermic reactions products as heat. Most chemical explosions Chemical explosions may be distinguished involve a limited set of simple exothermic from other exothermic reactions by the oxidation reactions (reactions with oxygen extreme rapidity of their reactions. In that release energy) (Urbanski, 2009). addition to the violent release of energy, The total amount of energy released chemical explosions must provide a means to in the reaction is called the heat of explosion. transfer the energy into mechanical work. It can be calculated as the difference between This is accomplished by expanding product the heat of formation of reactants and the heat gases from the reaction. If no gases are of formation of the products: E = Ef(reactants) - Ef (products) Table 3.1 shows the heats of formation for (reactants). The heat of explosion is positive the products and many common explosives for the exothermic reaction. Table 3.1: Heats of formation Name Formula MW (g/mol) Ef (kJ/mol) Carbon monoxide CO 28 -111.80 Carbon dioxide CO2 44 -393.50 Vapour H2O 18 -240.60 Nitroglycerin C3H5N3O9 227 -333.66 RDX C3H6N6O6 222 +83.82 HMX C4H8N8O8 296 +104.77 PETN C5H8N4O12 316 -514.63 Trinitrotoluene, TNT C7H5N3O6 227 -54.39 TETRYL C7H5N5O8 287 +38.91 Source: fas.org, 2011 Notes: 1) CO,CO2 and H2O are assumed to be in gaseous form. 2) Ef for N2, H2, O2 and all other elements are all zero. Since most of the energy release comes from trinitrotoluene (TNT), 10 moles of gas are oxidation reactions, the amount of oxygen produced for each mole of explosive. This available is a critical factor. If there is fact is exploited in Berthelot approximation insufficient oxygen to react with available to predict the relative explosive strength of a carbon and hydrogen, the explosive is material (as compared to TNT on a mass considered as oxygen deficient. The basis) (Yinon and Zitrin, 1996). converse is considered as oxygen rich. A The relative explosive strength quantitative measure of this is called the calculated in this manner is of limited use. oxygen balance (OB) (Akhavan, 2011). What is really important is the actual The strength of the explosive is strength, which can only be measured by determined by the conversion of the heat of experiment. Standard tests mostly involve a explosion into mechanical work, which is direct measurement of the work performed. dependent upon the amount of produced Examples of measurements for RDX are: gases available for expansion. In the case of 32 Eneh, O.C.: Chemical explosives: Warhead ally, Technoscience Review, 3(1&2), Nov., 2012 Ballistic mortar test 140 % Trauzl block test 186 % Sand crush test 136 % They all compare favorably with our Berthelot approximation (Fordham, 1980). Chemical explosive materials tetrazene explosive. Again, there are tetryl, Chemical explosives may be pure chemicals tetrytol, 1,3,5-triazido-2,4,6-trinitrobenzene, or mixtures. Cooper and Kurowski (1996) triethylene glycol dinitrate, trimethylolethane identified and listed alphabetically about 82 trinitrate, 2,4,6-trinitroaniline, trinitroanisole, of them as azides, fulminates, 1'-azobis-1,2,3- and 1,3,5-trinitrobenzene. Yet others are triazole, 4-dimethylaminophenylpentazole, 2,4,6-trinitrobenzenesulfonic acid, acetone peroxide, ammonium azide, and trinitrotoluene, trinitrotriazine, 2,4,6- ammonium chlorate. Others are ammonium tris(trinitromethyl)-1,3,5-triazine, urea dinitramide, ammonium nitrate, ammonium nitrate, and xylitol pentanitrate (Cooper and permanganate, barium azide, 1,2,4- Kurowski, 1996). butanetriol trinitrate, chlorine azide, and Explosive materials must be highly copper(I) acetylide. Again, there are energetic, as characterized by the relative copper(II) azide, diacetyl peroxide, strength, and must also react violently. The diazodinitrophenol, diethylene glycol speed of the reaction is vital to the build up dinitrate, 4,4'-dinitro-3,3'-diazenofuroxan, of a large amount of energy into a small 2,4-dinitrotoluene, erythritol tetranitrate, and volume. The rapidity of reaction is called the ethyl azide. Others are ethylene glycol shattering effect (or potential) or brisance dinitrate, FOX-7, HBT (explosive), (from the French meaning to "break") of the heptanitrocubane, hexamethylene triperoxide explosion. It is a property of the material and diamine, hexanitrobenzene, the degree of confinement. If an explosion is hexanitrodiphenylamine, and restrained initially, it can build up a large hexanitroethane. pressure and achieve the same effect. The Also, there are rapidity of the reaction is used as a method of hexanitrohexaazaisowurtzitane, classification of explosive materials hexanitrostilbene, HHTDD, HMX, lead (Urbanski, 2009). styphnate, lead(II) azide, manganese heptoxide, and mannitol hexanitrate. Again, Classification of explosive materials there are methyl azide, methyl nitrate, Explosive materials, which react very methylammonium nitrate, mononitrotoluene, violently (are brisant) are known as high nitramex and nitramon explosives, explosives. They are used solely for their nitrocellulose, nitrogen triiodide, and destructive power. In contrast, low nitroglycerin. Others are nitroguanidine, explosives are materials that react more nitromethane, nitrostarch, octaazacubane, slowly. They release a large amount of octanitrocubane, pentaerythritol tetranitrate, energy, but due to the relatively slow rate of pentazenium, and pentazole. Yet others are reaction the energy is more useful as a picric acid, picryl chloride, polyvinyl nitrate, propellant where the expansion of the gases potassium picrate, propylene glycol dinitrate, is used to move projectiles. An example RDX, silver acetylide,and silver azide would be gunpowder. It is true that (Cooper and Kurowski, 1996). confinement will increase the brisance of There are silver nitride, sodium azide, gunpowder, but there is a wide variety of styphnic acid, TATB, tetraazidomethane, materials that react much more quickly and
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