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Effects of Reaction Time Using the production of phenol as an indicator as to the decomposition of PEEK, it is possible to investigate the effects of the reaction time. A reaction time of 0 minutes is considered to be heating and cooling of the reactor exclusively; once the reaction temperature is reached the furnace is removed and the reactor is cooled. This study was carried out at 623 K to ensure that the PEEK was in the melt phase, and therefore amorphous. Figure 54 shows the concentration of phenol with respect to the reaction time. 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 20 40 60 80 100 120 140 Reaction Time (min) Figure 54: Phenol concentration [PhOH] with respect to reaction time, 623.15 K, [EtOH] = 20 %v, [H2O] = 80 %v, 16.8 ± 0.2 MPa, 10mg ml-1 Cs2CO3, 10 mg ml-1 PEEK. Determined by HPLC Figure 54 shows that the production of phenol has taken place when the reaction time is 0 minutes (i.e. heating and cooling only). This implies that the decomposition of PEEK either takes place slightly below 623 K or that the reaction kinetics are sufficiently rapid such that the decomposition is immediate under the said conditions, leading to the production of 187 [PhOH] mg ml-1PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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