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scMeOH (543 K, 8 MPa, 90 min) it is reported that the cross-links responsible for producing the thermosetting resin may be selectively destroyed, allowing for recovery of clean fibres and a thermoplastic resin [306]. It is further reported that the recovered thermoplastic may be cross-linked to produce a secondary thermoset resin, although the physical properties of the secondary resin do not mimic that of the virgin material. It is reported that scPrOH is able to achieve approximately 80 % decomposition after 60 min at 593 K, with significant quantities of char being produced as an undesirable side-product [307]. The complete removal of char is not reported, although the quantity may be reduced by increasing the reaction time to 300 min. Control over the number, and nature, of the products was achieved by addition of KOH as a catalyst. The use of scEtOH produces similar results to that of scPrOH. This may be attributed to the similar dipole moments (DP) of EtOH and PrOH which is ultimately responsible for the solubility of the decomposition products in the solvent. The response of the EtOH system to a basic catalyst is also the same as the PrOH system. It is noted that the use of acetone (DMK) (DP = 2.881), having a greater dipole moment, outperforms the use of MeOH (DP = 1.700), EtOH (DP = 1.691) and PrOH (DP = 1.679), with respect to the percentage decomposition, with the most notable increase being observed when the temperature was 573 K [308]. The strength, and therefore quality, of carbon fibres recovered from thermochemical processing varies according to the fluid, reaction temperature, reaction time and catalyst used. However, it is typically reported that the residual tensile strength of the recovered fibres is greater than 90 % of the virgin material [210, 306, 308]. It has been reported that in some instances the recovered fibres had a tensile strength exceeding that of the virgin material [304]. A significant advantage of thermochemical processing, aside from the ability to recover carbon fibres free of resin that maintain much of their initial tensile properties, is the ability 72PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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