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Figure 49 ‘b’ shows that without the addition of water the decomposition of PEEK does not readily take place, the carbon fibres are visibly confined within the polymer matrix. A co- solvent system consisting of the 80 %v H2O, 20 %v EtOH under the same conditions brings about complete decomposition of the polymer, allowing for separation of the fibres for subsequent testing and incorporation into new products. Having identified the ideal co- solvent composition with respect to ethanol concentration it was necessary to investigate the effects of the Cs2CO3 concentration. Effects of Caesium Carbonate Concentration By maintaining the concentration of ethanol at 20 %v (80 %v water), the reaction temperature at 623 K and a reaction time of 30 minutes the concentration of Cs2CO3 was varied from 0 – 10 mg ml-1. The reaction conditions are presented in Chapter 3.3.2, the results are presented in Figure 50. 182PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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