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Commercially available polyethersulfone (PES) and polyphenylquinoxaline (PPQ) resins were evaluated as high-temperature thermoplastics for advanced composite and adhesive applications. Continuous graphite reinforced laminates up to 400 plies thick were fabricated successfully from both systems, once processing parameters were defined. Structural as well as hemispherical shapes were postformed from consolidated flat laminates. Poor-quality panels were reprocessed to high-quality parts, using the thermoplasticity of the matrix resins.
The PES exhibited sensitivity to moisture as shown in the testing of both the neat resins and advanced composites. Adhesive bonds were also fabricated on 6A1-4V titanium adherends, using PPQ and thermoplastic processing techniques. The performance of the adhesive was improved significantly by the use of woven graphite scrim cloth. It is postulated that this scrim cloth results in significantly reduced residual stress in the bond line.
composite materials, graphite composites, thermoplastic resins, adhesives, polyphenylquinoxaline, polyethersulfone, postforming
Senior polymer chemist, Stanford Research Institute, Menlo Park, Calif