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) The diameter of single carbon fibres was confirmed by means of SEM, see Figure 27. When measured by SEM the diameter of a 150 mm single fibre was found to be 6.85 μm, the diameter calculated by EIM was 6.89 μm. Furthermore, the diameter of the 120 mm carbon fibre determined by SEM was 6.72 μm, (see Figure 28), while the diameter calculated by EIM was 6.55 μm, again showing good agreement between the values. The variation in fibre diameter along the length of a fibre was investigated by means of SEM. Diameter measurements were taken at 5 arbitrarily selected points for 5 arbitrarily selected fibres. The standard deviation was less than 0.05 for any single fibre and 0.13 for the entire sample population. Full data are available in Appendix 2. The greatest variation observed within a fibre (0.09 μm) represents an error of less than 3%. Therefore, variation within a fibre is not thought to be a significant source of error. 141

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