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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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Section A Section B Section C DTG 100 95 90 85 80 75 70 4 3 2 1 0 1000 1200 400 600 800 Temperature (K) Figure 117: TGA thermograph of Hexcel CFRP's used in the manufacture of wing spas, post processing (Sample CS3); T = 573 K, P = 15 ± 0.2MPa, tr = 60 min, [EtOH] = 100 %, [Cs2CO3] = 10 mg ml-1, [comp] = 67.5 mg ml-1 Figure 117 suggests that the fibre mass fraction is high, possibly greater than 70 %. It is also shown that significant quantities of resin remained within the CFRP after a reaction time of 60 minutes. This indicates that the resin used in the manufacture of this CFRP demonstrates greater resistance to the thermochemical processing than the BADGE based analogue. Due to the cross-sectional thickness of the sample it was necessary to separate the sample into three sections (A, B and C) for analysis by TGA. This constraint is due to the physical dimensions of the TGA pans. Separation into distinct sections is not possible pre-processing and impedes the use of TGA to directly determine the fibre mass fraction. SEM was used to analyse the surface of the CFRP (CS3) and is presented in Figure 118. 272 Mass (%) DTG (% min-1)

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