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Carbon Fibre Sample Preparation for Supercritical Fluid Processing. Bundles of carbon fibres, approximately 100 mm in length, were cut and loaded into the HTR. A full description of the HTR and ancillary equipment is provided in Chapter 3.2. A solvent loading of 50 %v was used for all experiments. To generate control samples, bundles of carbon fibre tow were cut into approximately 100 mm sections and subjected to processing with water, in the absence of a co-solvent or catalyst, as detailed in Table 14. With the reactor sealed, the furnace was switched on and allowed to reach the required set point. Once the set point was attained the reaction timer was started. Once the reaction time had elapsed the reactor was removed from the furnace and cooled using a water bath. The reaction time (tr) is defined as the amount of time that the reactor spends at the set point and does not include the time taken to heat and cool the reactor. Heating and cooling times were typically 50 and 30 minutes respectively. Table 14: Carbon fibre processing control sample generation Control T Sample (K) 1 523 2 573 3 623 Solvent tr [Cs2CO3] (min) (mg ml-1) H2O 30 0 The carbon fibres were processed in an identical manner to the control samples, differing only in the concentration of the solvents and catalyst and reaction temperature. The solvent concentrations used, according to the designed Taguchi Experiment design, are provided in Table 15. 105PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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