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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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Increasing the CO2 pressure further leads to results that are illegible without the use of extensive smoothing and noise reduction. In processing the data in this way, much of the valuable information is destroyed or manipulated such that it no longer may be considered representative of the experiment. As such, the use of HPDSC was limited. The data obtained are in very good agreement with the results obtained from the designed experiment (Chapter 4.1.2) and are used to provide insight into the interactions taking place between the CO2 and the polymer within the reactor. 4.1.4. Carbon Dioxide Containment with PEEK Having studied the interaction between CO2 and the polymer during polymer processing, it is prudent to investigate whether CO2 is released from the polymer upon depressurisation or retained for a period of time. Retention of CO2 within the polymer may influence the physical properties of the material, given that it has previously been established that the presence of CO2 can manipulate the glass transition and crystallisation temperatures and indirectly influence the melting temperature. The methodology for this investigation is presented in Chapter 3.3.1. and essentially comprises of processing PEEK with scCO2 and allowing for a period of time to elapse prior to analysis by TGA. A summary of the findings is presented in Figure 43. 172

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