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3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 20 40 60 80 100 [DMK] (%v) Figure 108: Effect of acetone concentration [DMK] on the mean tensile strength of carbon fibre (Toray T700S 50E); T = 623 K, tr = 30 min Carbon fibres processed in water ([co-solvent] = 0 %) at 623 K for 30 minutes are used as control samples shown in Figure 106 – Figure 108. Although data for virgin fibres were obtained, by definition, virgin fibres have not been exposed to the same temperature as the processed samples and therefore may respond differently to tensile testing. Using samples processed in water alone for the same period of time mitigates this potential source of error and presents only the effects of the co-solvents. By observation of Figure 106 – Figure 108, it is determined that the use of ethanol, propanol and acetone as co-solvents does not significantly degrade the tensile strength of carbon fibres. It is further identified that for the majority of cases where a co-solvent is used, the tensile strength of the fibres appears to be greater than when water is used alone. In some instances, the tensile strength of processed fibres exceed that observed when virgin fibres were tested, an effect that is not without precedent and is reported in the literature [304]. The tensile strength of virgin carbon fibres 260 Mean Tensile Strength (GPa)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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