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Table 26: Initial findings for the recycling of commercially available CFRP's Sample CS1 CS2 CS3 T (K) 573 P (MPa) 15.0 ± 0.2 tr (min) 60 Solvent EtOH [Cs2CO3] (mg ml-1) 10 [comp] (mg ml-1) 30.6 31.7 67.5 [PhOH] (mg ml-1) 1.010 0.000 0.042 Table 26 shows that the phenol concentrations in the reactor extract were lower than what was observed with epoxy resin alone. For a resin concentration of approximately 30 mg ml-1 the typical phenol concentration, recovered from the reactor, is approximately 2.5 mg ml-1. With a composite concentration ([comp]) of 30 mg ml-1 the concentration of recovered phenol was not expected to be 2.5 mg ml-1, owing to the composite having a mass fraction of carbon fibres. Carbon fibre mass fractions in excess of 50 % are not uncommon [324], reducing the mass of resin and subsequently lower concentrations of phenol are to be expected. However, without obtaining such information it is not possible to speculate further as to the magnitude of reduction to be expected. This fibre mass fraction does not account for the phenol concentration observed for CS3 (Table 26). The composite concentration is twice that of the epoxy resin loading used, despite this the phenol concentration is extremely low (0.042 mg ml-1). It is possible that the resins used for CS2 and CS3 are not predominantly phenol based. To investigate this hypothesis TGA of the processed samples was conducted and is given in Figure 117. 271PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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