| || 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.