| || Combustion Behaviour of Advanced Solid Propellants
Author : Asthana, S.N.;Mundada, R.B.;Phawade, P.A.;Shrotri, P.G.
Source : Defence Science Journal ; Vol:43(3) ; 1993 ; pp 269-273
Subject : 662.3 Propellants;66 Chemical Technology
Keywords : Ammonium perchlorate;Propellants;Burning rates;Propellant combustion;AP based compositions
Abstract : The study reports the effect of incorporation of Al and ammonium perchlorate (AP) individually and in combination with each other on combustion pattern and specific impulse (Isp) of minimum signature propellants. Incorporation of Al obviates the combustion instability problems; however, it has marginal effect on burning rates. The composition containing AP and zirconium silicate combination gives superior performance; however, its Isp is considerably lower than the composition incorporating 9 per cent AP. A combination of 6 per cent Al gave 20 per cent enhancement in burning rate and 12 s increase in Isp as compared to purely nitramine-based composition, cal-val results also reveal increase in energy output on incorporating AP and Al. Hot stage microscopic and propellant combustion studies indicate occurrence of intense decomposition reaction in case of AP-based compositions.
| || Interpenetrating Polymer Networks as Binders for Solid Composite Propellants
Author : Parthiban, S.;Raghunandan, B.N.;Jain, Sampat R.
Source : Defence Science Journal ; Vol:42(3) ; 1992 ; pp 147-156
Subject : 66 Chemical Technology;662.3 Propellants
Keywords : Poly methyl methacrylate;Burning rates
Abstract : A new family of polymeric binders for solid composite propellants is proposed, based on two component interpenetrating polymer networks (IPNs). These networks comprise two different polyurethanes based on hydroxy terminated polybutadiene and ISRO polyol interpenetrated with two different vinyl polymers, viz poly methyl methacrylate and polystyrene. the networks synthesized by the simultaneous interpenetrating technique have been characterized for their properties, such as stress-strain, density, viscosity, thermal degradation, and heat of combustion. Phase morphologies have been determined using electron microscopy. Suitable explanations have been adduced to rationalize the properties of IPNs in terms of their structures and chain interactions. A study of the mechanical properties and burning rates of the ammonium perchlorate (AP)-based solid propellant using the newly synthesised IPNs as binders, has been carried out. The results show that both mechanical strength and burning rate of solid propellants could be suitably modified by simply changing the nature and/or the ratio of the two interpenetrating polymer components.
| || Use of Closed Vessel as a Constant Pressure Apparatus for the Measurement of the Rate of Burning of Propellants
Author : Vittal, D.
Source : Defence Science Journal ; Vol:30(2) ; 1980 ; pp 69-74
Subject : 629.76 Rockets and Missiles ;629.762 Missiles
Keywords : Propellants burns ;Propellant;Burning rates
Abstract : A method for the determination of burning rates of propellants whose from function is unknown is introduced. The method consists of burning in the closed vessel, a known charge weight of the test propellant alongwith a known pressure which remains nearly constant during the burning of the test propellant whose web size is the only quantity required for the evaluation of its rate of burning. The test propellants burns at near constant pressure conditions just as in the strand burner technique. This method can be applied to any unknown propellant of any shape whose web size can be measured and very large webs also can be used. In addition, the measurement of the records and the computation are very simple.