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Given that the samples used were identical, having being produced in the same way, it was considered that the differences in the decomposition process may be of both chemical and physical phenomena. The data obtained suggest that should physical phenomena exist, it may be possible to identify them by means of Scanning Electron Microscopy (SEM) of the partially degraded resin samples. Attention is now focused on considering the physical state of the epoxy resin samples subjected to scEtOH and scPrOH processing. 5.2. SUPERCRITICAL FLUID INDUCED SWELLING OF EPOXY RESIN The use of Scanning Electron Microscopy (SEM) offers the opportunity to image the samples processed by scEtOH and scPrOH, paying particular attention to the surface characteristics. By analysing samples processed for differing lengths of time it is possible to follow the decomposition process, given that it has been previously established that the reaction time is an important factor (see Chapter 5.1). It has also been established that the reaction process proceeds differently in ethanol and propanol, although the major product in both instances is phenol (Chapter 5.1.4.). Since this investigation analyses the samples utilised in Chapter5.1. no separate reaction schedule exists. The reaction schedule used is presented in Chapter 3.3.3. Virgin samples of cured epoxy resin were used to compare and contrast the surface properties with those of processed samples. The SEM micrographs of the virgin samples are presented in Figure 98. 243PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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