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Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials

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Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials ( supercritical-fluids-and-their-application-recycling-high-pe )

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The residual pressure after cooling the reactor to room temperature is thought to be attributable to the production of decomposition gasses under supercritical conditions. The crosslinking agent (DDS) contains sulfur which may be oxidised to SO2. Whilst SO2 is soluble in ethanol [320], upon reaching saturation there additional SO2 would exist in the gaseous phase and therefore would persist at the end of the reaction. The decomposition reactions have been shown to be time dependent and it is therefore expected that should the gasses be produced as part of the decomposition process, the residual reactor pressure should increase as a function of reaction time. This was the observation shown in Figure 82. A linear correlation between the percentage mass loss and the phenol concentration would further indicate a major decomposition product of the reaction is phenol, and that the production of phenol is directly proportional to the decomposition of the polymer matrix. This is presented in Figure 83. 225

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