Development of Quality Assurance Methods for Epoxy Graphite Prepreg
The objective of this program was to develop quality assurance methods for graphite epoxy/prepregs. Liquid chromatography, differential scanning calorimetry, and gel permeation chromatography were investigated. These methods were applied to a second prepreg system. The program also sought to correlate the resin matrix formulation with mechanical properties. Dynamic mechanical analysis and fracture toughness methods were investigated. Liquid chromatography, differential scanning calorimetry, and gel permeation chromatography were all successfully developed as quality assurance methods for graphite epoxy prepregs. The liquid chromatography method was the most sensitive to changes in resin formulation. All three methods were successfully applied to a second prepreg system. No correlation could be established between mechanical properties and the resin formulation variations defined within this contract.
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APPENDIX AROUNDROBIN PROCEDURES FOR LIQUID
APPENDIX BMETHOD FOR DETERMINATION
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720 monomer Analysis of Narmco attenuation baseline Batch number Benzaldehyde Boeing Boeing Commercial Airplane cal/g calibration Chart speed Chromatogram of Narmco components correlation data obtained DDS/MY Detector response detector wavelength determined dielectric analysis differential scanning calorimetry dissipation factor DSC Curve DSC scan DuPont dynamic mechanical analysis evaluated fiber gel permeation chromatography GPC Chromatogram heat of polymerization Heating rate Hercules Resin Ibf/in2 ignition in./min infrared spectroscopy instrument parameters Integrator ion chromatography J/kg KClO4 Laminates LC analysis LC round-robin mcal/s/in ml/min Detector mobile phase Mobile-Phase modulus monomer Narmco Batch 286 Narmco Neat Resin Narmco Prepreg Batch Neat Resin Batch optimized peak height peak-area percentage Peak-area ratio Prepreg Batch 1072 reaction temperature onset relative standard deviation Resin advancement Resin Batch 300 retention Round-Robin Participant Schoniger flask second resin Shodex GPC A-802S shown in Figure shown in Table Solvent Task variability volumetric flask Waters u-Bondapak/C18