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repeat unit is comprised of carbon atoms, and therefore should the decomposition be minimal, the relative abundance of caesium will be greatly reduced. The EDX data for the two conditions are tabulated in Table 23. Reaction Time (min) 0 60 C O Cs (%) (%) (%) 80.75 16.08 3.17 73.75 17.28 8.96 Table 23: EDX Analysis of solid deposits after 0 and 60 minute reactions (conditions as in figure 57) The use of EDX in this context is not quantitative with respect to the entire sample, owing to its heterogeneity. EDX has been used to target deposits identified by means of SEM, allowing for the determination of their composition. Therefore, the quantitative analysis at any given point is not representative of the bulk sample. Thermogravimetric Analysis Thermogravimetric Analysis (TGA) was used to determine the percentage decomposition of PEEK. The thermal decomposition temperature is 848 K [105], at which point PEEK decomposes into a range of organic compounds. The quantity and composition of the remaining char is a function of the decomposition conditions, in an inert atmosphere N2 approximately 70% of a carbon fibre reinforced PEEK sample remains as char[105]. It is therefore expected that should the polymer be decomposed and the organic compounds solubilised during the reaction, the percentage mass loss observed by TGA would be significantly reduced. The remaining mass would be attributed char and to the carbon fibres since they are not subject to significant thermal degradation in inert atmospheres until 192PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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