Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials

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Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials ( supercritical-fluids-and-their-application-recycling-high-pe )

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Figure 27: SEM micrograph of a single carbon fibre used for EIM, 150 mm in length (full length not shown)..................................................................................................................141 Figure 28: SEM micrograph of a single carbon fibre used for EIM, 120 mm in length (full length not shown)..................................................................................................................142 Figure 29: Impedance as a function of the number of fibres within a carbon fibre bundle, 85 mm in length ..........................................................................................................................143 Figure 30: Bespoke carbon fibre alignment tool, manufactured by University of Birmingham, showing aligned fibre bundle set in Araldite Rapid resin......................................................149 Figure 31: DSC thermogram for PEEK150PF as received, 7.0 mg, DSC Method 1, endothermic-up .....................................................................................................................153 Figure 32: DSC thermogram for PEEK150PF generated by quenching from melt phase, 11.2 mg, DSC Method 1, endothermic-up.....................................................................................154 Figure 33: FT-IR Absorbance spectrum for PEEK150PF as received, full range not shown, A = 1307 cm-1, B = 1280 cm-1........................................................................................................156 Figure 34: FT-IR Absorbance spectrum for PEEK150PF post quenching, full range not shown, A = 1307 cm-1, B = 1280 cm-1 .................................................................................................157 Figure 35: WAXS Spectrum for PEEK150PF as received, 50 μm powder...............................160 Figure 36: WAXS Spectrum for PEEK150PF post quenching from melt phase......................161 Figure 37: Main effects plot for influence of CO2 processing pressure on glass transition temperature (Tg), T = 413 - 453 K, tr = 10 - 30 min ................................................................162 Figure 38: Cube plot for the effects of scCO2 processing on the glass transition temperature (Tg) of PEEK150PF observed by DSC. DOE conditions; T = 413 – 453 K, P = 5 – 15 MPa, tr = 10 – 30 min, centre-point T = 433 K, P = 10 MPa, tr = 20 min ....................................................163 15

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