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CHAPTER 8. CONCLUSIONS – THE PROCESSING AND RECYCLING OF HIGH PERFORMANCE MATERIALS FOR USE IN AEROSPACE AND RELATED INDUSTRIES It has been demonstrated that supercritical fluids may be used to influence the polymer transition temperatures of high-performance thermoplastic polymers and their composite materials. An initial investigation, using supercritical carbon dioxide (scCO2), revealed that as well as manipulating the polymer transitions, it is possible to confine gaseous CO2 within the polymer matrix. The release of CO2 from the polymer matrix was found to be temperature dependent, typically occurring at the glass transition and crystallisation temperatures. This was manifest as a mass loss observed by TGA, with FT-IR simultaneously performing analysis of carrier gas and thereby confirming the CO2 confinement theory. This insight is particularly useful when considering recycling by thermochemical means as it demonstrates the possibility of entrapment of small organic molecules, such as decomposition products, within partially degraded resins. By processing with scCO2 it is possible to induce crystallisation below the thermodynamic crystallisation temperature of PEEK, however, the induced crystallites are dissimilar to those spontaneously formed at the crystallisation temperature. High-Pressure Differential Scanning Calorimetry (HPDSC) was used to investigate the potential of supercritical fluids to reduce the melting temperature of PEEK. At present there is no evidence to substantiate this application, although there is a complex relationship between the use of CO2 and the melting temperature due to induced crystallisation. 275PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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