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 | Glycidyl Azide Polymer-based Enhanced Energy LOVA Gun Propellant
Author : Sanghavi, R.R.;Kamale, P.J.;Shaikh, M.A.R.;Chakraborthy, T.K.;Asthana, S.N.;Singh, Amarjit
Source : Defence Science Journal ; Vol:56(3) ; 2006 ; pp 407-416
Subject : 662.3 Propellants
Keywords : Low vulnerable ammunition;LOVA;Glycidyl azide polymer;GAP;Gun propellant;Triacetin;Cellulose acetate;Energetic plasticiser;Force constant;Combustion characteristics;HFCI;Hot fragment conductive ignition
Abstract : In this study, cyclotrimethylene trinitramine propellants with triacetin (TA)-plasticised cellulose acetate (CA) and nitrocellulose (NC) combination as binders were evaluated for low vulnerable ammunition (LOVA). Triacetin was replaced by energetic plasticiser; glycidyl azide polymer (GAP) in increments to enhance the performance in terms of force constant . In addition to ballistics, parameters like vulnerability, mechanical and thermal properties of GAP-based propellants in comparison to those of TA-based propellants, were also determined. The study brings out that the incorporation of 2-6 per cent GAP in place of TA resulted in the enhancement of force constant by 22-70 J/g and improved overall combustion characteristics. DSC revealed that thermal decomposition of GAP-LOVA propellants evolved more energy than TA-LOVA propellants. GAP-based LOVA propellant similar to TA-plasticised LOVA propellant, was found superior to NQ propellant in vulnerability tests as well as in hot fragment conductive ignition (HFCI) studies. As regards mechanical properties, incorporation of GAP resulted in improved compression strength. |
| | Evaluation of Energetic Plasticisers for Solid Gun Propellant
Author : Damse, R. S.;Singh, Amarjit
Source : Defence Science Journal ; Vol:58(1) ; 2008 ; pp 86-93
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : Energetic plasticiser;Flame temperature;Force constant;Mechanical properties;Burning rate characteristics
Abstract : This paper reports the evaluation of four different energetic plasticisers, viz., glycidyl azide polymer (GAP, MW = 390), 1,5-diazido-3-nitrazapentane (DANPE), ethylene-glycol-bis-azidoacetate (EGBAA) and N-n-butyl-N-(2 nitroxyethyl) nitramine (n-Bu-NENA) separately into high energy gun propellant containing 28 per cent NC (13.1 N %), 65 per cent RDX, 6 per cent di-octylphthahate (DOP) and 1 per cent carbamite. Four different propellant compositions based on the energetic plasticiser have been formulated separately with the replacement of non-energetic plasticiser, DOP. The propellants were processed by standard solvent method and evaluated experimentally along with the control composition to determine the ballistic parameters, cal-val, sensitivity, thermal characterisation, thermal stability and mechanical properties. The performance of the propellants containing the energetic plasticiser has been compared with that of the control composition containing the non-energetic plasticiser, DOP so as to assess the suitability of the energetic plasticiser for the futuristic gun propellant formulations. It has been found out that n-Bu-NENA is the superior plasticiser among the four energetic plasticisers evaluated in this study. |
| | High Impetus Cool Burning Gun Propellants
Author : Damse, R.S. ;Redkar, A.S.
Source : Defence Science Journal ; Vol:50(3) ; 2000 ; pp 281-288
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : High energy gun propellants;Energetic oxidiser;Glycidyl azide polymer;Energetic plasticiser;Ballistic parameters
Abstract : "This study explores the possibility of reducing the flame temperature (T/sub f/) without decrease in impetus of RDX-NC matrix-based high energy gun propellants by partial replacement of RDX with triaminoguanidine nitrate (TAGN). Compositions containing TAGN as an energetic oxidiser with varying percentage of RDX have been formulated. Glycidyl azide polymer was incorporated as an energetic plasticiser to achieve the higher level of impetus. Performance in terms of ballistic parameters (theoretical/experimental) sensitivity, thermal characteristics, stability and mechanical properties was evaluated and compared with the basic composition containing RDX as a single oxidiser. Experimental data indicates that the partial replacement of RDX by TAGN in gun propellant compositions decreases T(sub f) significantly with only marginal decrease in impetus. " |
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