Structure‐property relationship of HTPB‐based propellants. I. Effect of hydroxyl value of HTPB resin

Abstract

SYNOPSISComposite propellants based on hydroxyl-terminated polybutadiene ( HTPB ) resin are the most common contemporary solid propellants for launch vehicle and missile applications. A series of HTPB resins, manufactured by free-radical polymerisation using a peroxide initiator, with varying molecular weights and hydroxyl values, was used in propellant formulation experiments with a view to studying the resin production variables and their influence on the resultant propellant properties. It is seen that HTPB resins with a wide range of hydroxyl values could be effectively utilized in propellant formulations. Also, propellants with higher strain capability and chain flexibility could be produced from lower hydroxyl value resins.

Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

“…Therefore, depending on the environmental conditions, changes on mechanical properties of propellant binders may compromise the structural integrity of solid rockets, leading to service life constraints 4 . Since the service life of rockets are largely dependent on the behavior of mechanical properties during aging, a formulation parameter such as NCO/OH ratio, which undoubtfully affects the mechanical properties 5,6 , may also affect the aging behavior of solid propellant binders and, by doing so, the reliability of rocket systems. A study 7 carried out for aging of sixteen HTPB/IPDI-composite propellants has found out that changes were faster when formulations were prepared with higher NCO/OH and triol/diol ratios.…”

Functionalization of hydroxyl terminated polybutadiene with biologically active fluorescent molecule

“…cis, trans and vinyl) are possible because of the probability of addition of monomers in three different ways during polymerization. The quantity of microstructure present in HTPB sample dictates the flow characteristics of the sample and the mechanical properties of the corresponding polyurethane (Manjari et al 1993;Nazare et al 1993). The HTPB based polyurethanes have also been studied in the literature by several authors for the separation of organic compounds, selective adsorption of proteins and selective gas transport properties (Chen et al 2000;Yang and Lin 2001;Gupta et al 2002).…”

Shelf Life Prediction of Propellants Using a Reaction Severity Index

“…Polymeric networks such as cross-linked polyurethanes are widely used as binders in composite propellant formulations (1,2) . Reliability of the propellants strongly depends on the mechanical properties of the binder which in turn are related to the polymer network integrity and stability.…”