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Not Available There is a need for new lightweight materials from which rocket and missile components can be economiclly mass produced (e.g., by molding or extrusion). Maxdem has developed a unique family of self-reinforced thermoplastic polyparaphenylenes, parmaxTM resins, combining exceptional strength, stiffness, thermal stability, and processability. The ParmaxTM materials are 2-3 times stronger and 3-5 times stiffer than any other un-reinforced isotropic plastic. We propose to modify ParmaxTM resin with POSS groups to increase Tg, heat distortion temperature, hardness, oxidative stability, and ablative properties. The properties of ParmaxTM enhanced with POSS will be ideal for the desired rocket and missile applications. During Phase I, processing characteristics of the Poly-XTM materials will be evaluated. Related efforts include developing an initial database of relevant properties such as mechanical performance at cryogenic and elevated temperatures, determining resistance to rocket fluids (e.g.liquid oxygen and hydrogen), and initial scale-up of optimized resins.