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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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Once the resin had cured, the carbon fibre bundles were loaded into to the Universal Testing Machine (UTM). The bundle of fibres were gripped at either end, with the grips in contact with the resin. A testing speed of 2 mm min-1 was used, the fibre bundles being tested to destruction. Since the number of fibres in the bundle was known, from EIS measurements, it was possible to determine both the average maximum tensile force and average work done per fibre. Knowledge of the number of fibres also facilitated in determination of the average tensile strength. Statistical analysis of the carbon fibre bundle properties was carried using MinitabĀ® (Minitab Inc. USA). Tensile Testing of Carbon Fibres The tensile testing of single and bundles of carbon fibres is described in detail in Chapter 3.4.4. The method for accurately determining the number of carbon fibres in a given bundle was developed as part of this research. This method is also described in full in Chapter 3.4.4. 3.3.5. Recycling of Carbon Fibre Reinforced Polyepoxide Composite Materials An initial investigation into the effects of the processing conditions used to decompose a model polyepoxide resin, see Chapter 3.1, was carried out. This research directs future research into the use of such conditions to decompose a range of thermoset and thermoplastic polymers and their associated composite materials. Since the intention was to assess the viability, similarities and differences between the model epoxy resin and a commercially available CFRP, the methodology of this initial investigation is identical to that carried out in Chapter 3.3.3. The reaction schedule for this limited investigation is given in Table 17. 108

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