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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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Figure 105: Comparison between tensile strength of single fibres and the mean fibre within abundle;T=623K,tr =30min,[EtOH]=80%v,#Singlefibretest=40,#Fibrebundletest= 5 x 300....................................................................................................................................257 Figure 106: Effect of ethanol concentration [EtOH] on the mean tensile strength of carbon fibre (Toray T700S 50E); T = 623 K, tr = 30 min......................................................................259 Figure 107: Effect of propanol concentration [PrOH] on the mean tensile strength of carbon fibre (Toray T700S 50E); T = 623 K, tr = 30 min......................................................................259 Figure 108: Effect of acetone concentration [DMK] on the mean tensile strength of carbon fibre (Toray T700S 50E); T = 623 K, tr = 30 min......................................................................260 Figure 109: Effect of Cs2CO3 catalyst on the tensile strength of carbon fibres. T = 623 K, tr = 30 min; FL1: H2O; FL2 H2O, [Cs2CO3] = 10 mg ml-1; FL3: [EtOH] = 80 %v; FL4: [EtOH] = 80 %v, [Cs2CO3] = 10 mg ml-1 .............................................................................................................261 Figure 110: High-resolution XPS carbon spectrum of virgin carbon fibre, Toray T700S .......263 Figure 111: High-resolution XPS oxygen spectrum of virgin carbon fibre, Toray T700S.......263 Figure 112: High-resolution XPS nitrogen spectrum of virgin carbon fibre, Toray T700S.....264 Figure 113: High-resolution XPS silicon spectrum of virgin carbon fibre, Toray T700S ........264 Figure 114: Functional group distribution on the surface of virgin carbon fibre, determined by XPS.....................................................................................................................................266 Figure 115: Functional group distribution on the surface of processed carbon fibres; T = 523 K, tr = 30 min, [EtOH] = 80 %v, determined by XPS ...............................................................267 Figure 116: Relative abundance of carbonyl functional groups post-processing, determined by XPS; PS1, T = 523 K; PS2, PS3, PS4, T = 573 K; PS5, T = 623 K ...........................................268 23

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