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blisters are formed, having a much greater diameter than the pores formed within the bulk of the sample. The evolution of these large blisters occurs more slowly than the rapid formation of the pores, and they become visible after 30 minutes under reaction conditions and still remain visible after 45 minutes. Conversely, the pores, although few are visible when the reaction time is 0 minutes, are wide spread and likely to be found throughout the bulk sample within 10 minutes. This is consistent with the observation that 79.2 % of the polymer is decomposed within the first 30 minutes and, an additional 50 % reaction time is required to decompose a further 14 %. A doubling of the reaction time from 30 to 60 minutes is required to decompose the entire sample. It was observed that the decomposition of the polymer resin in supercritical propanol scPrOH progressed in a slightly different manner to when scEtOH was used, both reaction conditions incorporating the use of Cs2CO3 as a catalyst. Ethanol was found to be more aggressive with respect to the percentage mass loss, whereas scPrOH appeared more selective with respect to the formation of decomposition products. In light of these differences, the decomposition under scPrOH was also investigated by SEM. Supercritical Propanol Supercritical propanol was proven to be less aggressive with respect to the percentage decomposition of the polymer resin. It would therefore be expected that the decomposition process proceeds in a slightly different manner. The same reaction times (tr) that were used for the ethanol investigation, tr = 0, 10, 30 and 45 minutes, were selected for the propanol 248PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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