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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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It is possible that this is a fundamental consequence of exposing carbon to microwaves and is currently under research as a method of producing activated carbon [294-296]. Molten Salts The use of molten potassium hydroxide (KOH) to decompose epoxy resins has been investigated, showing that the recovery of carbon fibres retaining up to 95 % of their original tensile strength is possible [297]. However, recovery of polymer decomposition products from the molten KOH was not investigated and therefore remains a challenge to the employment of this technique. It is not thought to be beyond reason to suggest that a solution may be sought, although LCA would be required to determine the environmental impact of the entire process. Chemical Recycling Process Technologies Dissolution The use of nitric acid to dissolve an epoxy matrix has been investigated, with results showing that is both possible to dissolve the resin, extract the decomposed resin products and re-polymerise to synthesise a new resin [298]. This approach has also been applied to GFRP’s, with results showing that the presence of glass fibres does not have an observable effect [299]. There are environmental concerns with the use of large quantities of concentrated nitric acid and, given that neutralisation is a pre-requisite to the extraction process, the use of nitric acid in this context is not considered sustainable. Incidentally, although this approach is not likely to be applied to CFRP’s, research has demonstrated that 70

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