| || Nitramine Double Base Propellants
Author : Singh, S.N. ;Subramanian, G.V.;Gautam, G.K.;Bhalerao, M.M.
Source : Defence Science Journal ; Vol:46(4) ; 1996 ; pp 207-214
Subject : 662.3 Propellants;66 Chemical Technology
Keywords : Combustion mechanism;Double base matrix;Glycidyl azide polymer ;Nitramine DB propellants;Propellants
Abstract : This review paper broadly covers the studies conducted on nitramine double base (DB) propellants, particularly in the field of formulations, evaluation, catalysis and combustion mechanism . Addition of RDX and HMX in double base matrix shows relatively low burn rates and high paper index values. Further, the burn rate of this class of propellants enhances in the presence of energetic binders/plasticisers like glycidyl azide polymer. This paper also discusses the combustion mechanism of HMX/RDX-based DB propellants, especially in the presence of catalytic salts. As scanty data is available on extruded nitramine DB propellants, further work is needed in the field of formulation as well as evaluation with a view to generate exhaustive data.
| || Effect of High Energy Materials on Sensitivity of Composite Modified Double Base CMDB Propellant System
Author : Choudhri, M.K.;Dhar, S.S.;Shrotri, P.G.
Source : Defence Science Journal ; Vol:42(4) ; 1992 ; pp 253-257
Subject : 66 Chemical Technology;662.3 Propellants;620.261 Explosives
Keywords : Double base matrix
Abstract : The shock sensitivities (viz, impact and friction) of composite modified double-base (CMBD) ingredients, double-base (DB) matrix (SNC:CL) and the effect of high energy materials like ammonium perchlorate (AP), cyclotrimethylene trinitramine(RDX), cyclotetramethylene tetranitramine (HMX) and pentaerythritol tetranitrate (PTN) on a CMDB system, have been studied. Individual ingredients of DB matrix, i.e., spheroidal nitrocellulose (SNC) and desensitised nitroglycerine (casting liquid (CL), do not appear to be very sensitive to impact and friction, impact of 36.0 kg each. Various DB mixtures gave impact ranging between 56.5 to 61.5 cm and friction insensitivity of 36.0 kg for all the formulations. But addition of AP to DB matrix increases the impact and friction sensitivity tremendously, impact ranging from 15 to 24 cm and friction from 2.0 to 3.2 kg. Sensitivity-wise addition of RDX, HMX, and PETN to DB matrix follows AP while the addition of Al slightly reduces the sensitivity.