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DTIC ADA242297: Case Bond Liner Systems for Solid Rocket Motors

Construction of a case bond liner system for solid rocket motors involves a series of processes designed to satisfy a variety of launch vehicle parameters. An attempt to understand the chemistry and processing variables and how they affect the interfacial bonding properties in barrier liner propellant formulations is presented. Inter diffusion rates and the rate of cure of each to the layers must be considered together to minimize changes in cure stoichiometries in the interfacial zones. The control of barrier layer cure is essential, not only to reduce migration of reactants and plasticizer from liner and propellant, but also to provide an active surface for adhesion to the liner. The importance of the proper characterization of the hydroxylterminated polybutadiene binder should not be underestimated. Because the binder material is a constituent of both the liner and the propellant, variation in cure times can impact diffusion rates. The complexity of case bond liner systems has increased over time, and with it, the number of variables. As more than one variable operates near its specification limit, the potential for failure becomes statistically significant. It is recommended th

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