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Upon exposure to temperatures beyond its continuous use temperature for extended periods of time, PEEK undergoes radical formation and subsequent cross-linking, leading to the degradation in physical properties. Cross-links are not destroyed during melt processing and consequently impeded the polymer’s ability to be quenched into the amorphous state. The incorporation of reinforcing fibres, forming a composite material, inhibits melt processing due to concerns over the lack of fibre alignment control. Moreover, melt processing does not remove contaminants from the polymer matrix. It has been shown that the application of supercritical fluid mixtures, either ethanol or propanol and water, may be used to decompose PEEK at 623 K within 30 minutes when used with a caesium carbonate (Cs2CO3) catalyst. Effects of the co-solvent concentration, catalyst concentration and reaction time are presented. The decomposition reaction is found to be 1st order with respect to the Cs2CO3 concentration, the optimum reaction time being 30 minutes. The optimum co-solvent concentration is dependent upon the solvent and was found to be 20 %v for ethanol and water mixtures. Analysis of the decomposition products was carried out by High-Performance Liquid Chromatography (HPLC), Gas Chromatography Mass Spectrometry (GC-MS), Fourier Transform Infra-Red Spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy Energy Dispersive X-Ray Spectroscopy (SEM-EDX) and Thermogravimetric Analysis (TGA). Variation of the co-solvent concentration allows for the decomposition of a 2,2-Bis[4- (glycidyloxy)phenyl]propane (BADGE) based high-performance thermoset resin, cross-linked with 4,4’-diaminodiphenyl sulfone (DDS). This particular resin is analogous to resins used to produce carbon fibre reinforced polymers (CFRP’s) and was synthesised as part of this 276PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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