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a.) b.) Figure 98: SEM Micrographs of virgin samples of cured epoxy resin showing; a.) top surface, Mag = 250x, WD = 10.2; b.) cross-section, Mag = 2500x, WD= 10.1 It can be seen from Figure 98, ‘a’ and ‘b’, that the surfaces of the virgin samples are smooth and free of voids, cavities and contours. Figure 98 ‘b’ shows part of the cross section, in particular the face that was cut. As to be expected, the surface roughness is greater owing to the random fracturing of the material when cut. Using the virgin samples as a control, the processed samples are studied. Previous work has determined the percentage mass loss of the epoxy resin as a function of time (see Chapter 5.1), therefore, using SEM imaging it is possible to study the process of decomposition. Supercritical Ethanol Supercritical ethanol (scEtOH) was shown to be aggressive with respect to the decomposition of the epoxy resin. It was also observed that the mass of the processed sample was greater than that of the initial sample when the reaction time was 0 minutes (zero time corresponds to solely heating and cooling). This was observed both in the presence and absence of Cs2CO3 and therefore suggests that the ethanol reacts with the epoxy resin, producing organic molecules that become bound to, or entrapped within, the 244PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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