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B A C 10 15 20 25 30 35 40 Retention Time (min) A D E 10 15 20 25 30 35 40 Retention Time (min) ab Figure 97: GC-MS Chromatogram comparison of decomposition products. T = 573 K, t = 30 min, [Cs2CO3] = 10 mg ml-1; a.) [EtOH] = 100 %, b.) [PrOH] = 100 %. A = phenol, B = 4-(1-methylethyl)-phenol, C = p-isopropenylphenol, D = 2-(1- methylethyl)-phenol, E = 3-(1-methylethyl)-phenol. Figure 97, ‘a’ and ‘b’, shows that for a 30 minute reaction time, ethanol produces substituted phenols that are not observed when propanol is used. This is in good agreement with the observation that although ethanol is more aggressive with respect to the percentage decomposition of the resin, propanol yields higher concentrations of phenol. These data (Figure 94 – Figure 97) suggest that ultimately the choice of solvent system is dependent upon the objective and desired products. If the objective is to decompose a thermoset epoxy resin, resulting in the minimum residual resin for a given reaction time then ethanol is a more effective solvent than propanol. Conversely, if the objective is to recover higher purity decomposition products, to facilitate in the downstream processing, propanol is a more effective solvent than ethanol. 242PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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