Effect of Long-Chain Bonding Agent on the Combustion of Composite Propellant and Modification of Combustion Performance Using Nano Additives

Novel long-chain bonding agent MST was synthesised and introduced into the bonding agent matrix in order to enhance the mechanical properties of composite propellant by improving the interfacial interactions between the bonding agent and solid particles, in order to withstand stresses produced due to combustion loading conditions, changes in environmental condition, transportation and handling without effecting on the ballistic performance. In this work, the replacement of the long-chain MST bonding agent instead of the most famous reference MAPO bonding agent has improved the mechanical properties especially strain value corresponding to stress value which doubling the maximum strain value with an acceptable value of maximum stress with a good value with Young's modulus in propellant formulations. Different compositions of composite propellant were carried, in order to measure the linear burning rate and to study the effect of the replacing MST bonding agent instead of tradition bonding agent MAPO. Due to the presence of a bonding agent, the burning process of the composite propellant should become more regular and stable burning but it reduces slightly the burning rate as in formulation F2 in which the pressure exponent (n) value reached .067. It should be modifying the reduction in burning rate due to the presence of MST in order to achieve promising burning properties. By using nano-aluminum it was secured improving performance and achieved a high burning rate of the propellant formulations based on MST bonding agent as well as the composite propellant formulations based on MAPO bonding agent. And by using nano-copper chromite the values of the burning rate of composite propellant formulations became greater than those values of formulations based on nano-aluminum with the same weight ratio and particle size, due to the nature of copper chromite and its effect on the binder and the ammonium perchlorate.