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min-1). This is due to the reduced quantity of PEEK remaining within the sample, and is further evidence of the decomposition of the polymer matrix. Broadening of the DTG is indicative of an impure material or a mixture of products. The PEEK decomposition products have different decomposition temperatures to PEEK and, given that there are a range of different products, the decomposition of the sample observed by TGA takes place over a range of temperatures. This leads to a broad and, due to the number of different products, a shallow peak. As phenol is soluble in water it is not identified by TGA and does not influence these results. 4.2.3. Acetone and Water Co-solvent System In attempting to use acetone (DMK) as a co-solvent a technical challenge was encountered. The intention was to vary the concentration of acetone from 0 to 100 % in discrete intervals, in-line with the work carried out using ethanol and propanol as co-solvents with water (see Chapter 3.3.2). In doing so, it was discovered that acetone and water mixtures containing 10 mg ml-1 Cs2CO3 react with the reactor seal. Degradation of the reactor seal subsequently takes place, leading to rapid depressurisation and loss of containment. Acetone concentrations of up to 20 %v did not degrade the reactor seal within 30 minutes and therefore initial results are reported. The reactor seal, supplied by Scientific and Medical Products Ltd (UK), is constructed from graphite. This is a requirement in order to withstand the temperatures that the reactor is routinely subjected. Although no loss of containment was observed when the acetone concentration was 20 %v, including 10 mg ml-1 Cs2CO3, it was deemed inadvisable to 207PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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