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to recover the polymer decomposition products. Thermochemical processing may be applied to thermoplastics, as well as thermosets as demonstrated. The use of carbonate based catalysts in the decomposition of both high-performance thermoplastics and high- performance thermosets has been reported [171], yielding phenol as a common major product. 2.6. SUMMARY OF LITERATURE REVIEW FINDINGS Thermochemical processing, achieved by the use of supercritical fluids, represents an opportunity to recycle thermoset and thermoplastic materials and their composites. According to the specific reaction conditions used, it is possible to selectively decompose polymers and obtain reinforcing fibres free of resin which, if characterised, may potentially be used to produce secondary composite materials. It is evident that the choice of working fluid is crucial since it governs the minimum temperature and pressure (defined by the critical point), solubility of the reaction products and the solubility of the catalyst, should one be used. It has been demonstrated that mixtures of solvents will exhibit a critical point between that of the individual solvents and that the use of immiscible fluids may offer opportunities since all supercritical fluids are miscible in all proportions. The properties of recovered fibres, including surface conditions and the presence of sizing, must be established in order for the creation of a composite recycling industry. Research on surface treatment of carbon fibres has been presented, although the technology is not yet mature. The ability of thermochemical processing to be applied to both thermoset and thermoplastic composite materials, in conjunction with the opportunity to potentially take advantage of 73PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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