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Figure 78 and Figure 79 show the linear relationship between the caesium carbonate concentration, percentage mass loss and phenol concentration respectively. From inspection of Figure 78 it is evident that when the ethanol concentration is 100 %, without the addition of caesium carbonate the final mass of the polymer is greater than the initial mass. This is in stark contrast to the control samples, containing 100 % water without the addition of caesium carbonate, where the mass loss was 7.9 %, but is in accordance with what was observed during the investigation into the decomposition of PEEK (see Chapter 4.2). With Figure 78 and Figure 79 both showing linear relationships with respect to the caesium carbonate concentration, it follows that the decomposition of the polymer matrix ultimately leads to the production of phenol, indicating that these findings are in accordance with results presented in the literature [167, 305, 319]. Effect of Reaction Time Having established the effect of the concentrations of the caesium carbonate and ethanol, the reaction time was varied from 0 to 60 minutes in discrete intervals. The optimal solvent and catalyst concentrations, established previously, were selected for this study. The percentage decomposition of the epoxy resin and the concentration of phenol in the resulting reactor liquor were measured and used as a means of characterising the reaction. Figure 80 and Figure 81 show the percentage mass loss and phenol concentration with respect to the reaction time. 222PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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