Multi-functional Polymers for Composite Structures (MSC P6026)

Filament wound composite structures employed in high performance tactical missile systems are susceptible to catastrophic failure from impact and thermal loading. The use of composite case technology provides some inherent advantages over metallic cases in that the pressure containment capability may be defeated prior to propellant ignition. While prior approaches to improving Insensitive Munitions (IM) performance have achieved some degree of success, this has usually been at the expense of additional weight, labor costs, poor processing characteristics or reduced structural integrity. The proposed research program involves the development and evaluation of carbon fiber reinforced composite motor case materials with multiwall nanotubes (MWNTs) dispersed in the resin matrix to achieve tailored thermal conductivity characteristics for enhanced Insensitive Munitions performance. The key technical challenges to be addressed under the proposed Phase I program will be to establish the optimal MWNT concentration, aspect ratio distribution and dispersion process conditions to achieve the thermal/electrical conductivity and mechanical performance goals without significantly altering the processing characteristics. Micromechanics-based analytical tools and process trials will provide important information on the influence of MWNT aspect ratio and concentration on thermal, electrical and mechanical properties.