English

DTIC ADA1022178: Graphite Reinforced Thermoplastic Composites.

The objectives of this program were to: (1) Develop graphite reinforced thermoplastic composites that are resistant to aircraft fluids and, (2) Evaluate repair techniques suitable for use on aircraft stationed with the fleet. The thermoplastic resins obtained from material suppliers and evaluated were PKXA polysulfone, KM-1 polyether sulfone, XU-218 thermoplastic polyimide, CM-1 fluorocarbon based polymer, and BR-31 polyphenylene sulfide. Also, a modified polysulfone (NTS 20-1) was invented, synthesized and evaluated. Resin characterization studies were performed. Impregnation and laminating procedures were optimized. Mechanical properties were determined on graphite reinforced composites. A study was conducted to determine resistance of graphite fabric/thermoplastic composites to fluids likely to be encountered in aircraft flight and maintenance operations. Two procedures for repairing graphite composites using thermoplastic materials were investigated. They were: use of a glue gun and, resistance heating of a metallized scrim that had been impregnated with a thermoplastic resin. (Author)

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