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Inspection of Figure 80 and Figure 81 shows that the reaction progresses rapidly between 5 and 45 minutes, at which point the percentage decomposition is in excess of 90 %, producing a phenol concentration of 2.7 mg ml-1. Extending the reaction time to 60 minutes results in the complete decomposition of the polymer resin, with no recoverable solids, and a phenol concentration of 3.1 mg ml-1. It is suggested that when the percentage decomposition of the polymer matrix of a CFRP is greater than 90 % it is likely that a significant proportion of the carbon fibres would have been released, as was observed with PEEK (see Chapter 4.2). It follows that extension of the reaction time beyond 45 minutes may not be economical, since a 33 % extension to the reaction time yields less than 10 % additional decomposition. It was noted that the residual pressure within the reactor at 313 K was proportional to the reaction time as is shown in Figure 82. 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 0 10 20 30 40 50 Reaction Time Figure 82: Reactor residual pressure at 313 K as a function of reaction time for [EtOH] = 100 %, T = 576 K, [Cs2CO3] = 10 mg ml-1, [Resin] = 35 ± 5 mg ml-1, P = 14.7 ± 0.3 MPa, R2 = 0.9661 224 Residual Pressure (MPa)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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