| || Challenges at the Frontiers of Science and Technology
Author : Aatre, V.K.
Source : Defence Science Journal ; Vol:43(3) ; 1993 ; pp 285-290
Subject : 355 Defence Sciences
Keywords : Armament;Science;Technology
Abstract : Abstract not available.
| || Synthesis and characterisation of bis azido methyl oxetane and its polymer and copolymer with tetrahydrofuran
Author : Nair, J.K. ;Satpute, R.S. ;Polke, B.G. ;Mukundan, T. ;Asthana, S.N. ;Singh, Haridwar
Source : Defence Science Journal ; Vol:52(2) ; 2002 ; pp 147-156
Subject : 623.4 Armaments and Ballistics;623 Military Science and Engineering
Keywords : Explosives ;Armament ;Copolymers ;Tetrahydrofuran
Abstract : "Bis-azido methyl oxetane (BAMO) was synthesised from pentaerythritol in two steps. Pentaerythritol was chlorinated to yield a mixture of mono, di, tri and tetra chloro compounds. The trichloro compound on ring closure gives bis-chloro methyl oxetane (BCMO). It was reacted with sodium azide in aqueous medium to obtain BAMO. The latter was polymerised using BF3 etherate catalyst and 1,4-butanediol initiator. Similarly, the BAMO- THF copolymer was also synthesised. All the monomers and polymers were characterised by IR, 1H-NMR, 13C-NMR, and refractive index. The polymers were also characterised for molecular weight, hydroxyl value, etc. Thermal analysis showed that both polymers degrade exothermically with T max of 237 °C for poly BAMO and 241°C for BAMO- THF copolymer with activation energy of 39 kcal/mol and 40 kcal/mol, respectively. Explosive properties like impact and friction sensitivity of BAMO and the other polymers were also determined. "
| || Ballistic evaluationof LOVA propellant in high calibre gun
Author : Pillai, A.G.S.;Sanghavi, R.R. ;Dayanandan, C.R. ;Joshi, M.M.;Karir, J.S.
Source : Defence Science Journal ; Vol:51(2) ; 2001 ; pp 147-153
Subject : 662.3 Propellants
Keywords : Ballistics ;Propellant;Armament
Abstract : 'This paper presents the data obrained on dynamic firing of a cellulose acetate binder-based low vulnerability ammunition (LOV A) propellant using 120 mm fin-stabilised armour piercing discarding sabot (FSAPDS) kinetic energyammunition. An optimised propellant composition formulated ~sing fine RDX as an energetic ingredient and a mixture of cellulose acetate and nitrocellulose as binder was qualified fit for firing in a high calibre gun by its successful static evaluation for absolute ballistics using high pressure closed vessel technique. Dynamic firing of the propellant processed in heptatubular geometry was undertaken to assess the propellant charge mass. This propellant achieved higher muzzle velocity as compared to the standard NQ/M119 triple-base propellant while meeting the non-vulnerability characteristics convincingly.