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similar synergistic effect is responsible for the reduced tensile strength of fibres processed with both a co-solvent and catalyst (FL4), or co-solvent alone (FL3), in comparison to fibres processed with water and the catalyst (FL2). Insight into this synergy may begin with the understanding that FL3 and FL4 were conducted in supercritical fluid mixtures, whereas FL2 is in sub-critical water. Further investigation of this effect is recommended in order to confirm the inference stated. 6.2. EFFECTS OF RECYCLING ON CARBON FIBRE SIZING During the manufacturing process of carbon fibres, a polymer sizing is applied to the surface of the fibres to facilitate good adhesion between the carbon fibres and the polymer matrix of a CFRP. A description of the manufacturing process of carbon fibres is provided in Chapter 2.4. The composition of the sizing is held in commercial confidence and is therefore not available in the public domain. It is likely that the composition of the sizing varies between manufacturers, although the fundamental principle is constant. Using X-Ray Photoelectron Spectroscopy (XPS) it is possible to analyse the surface of carbon fibres, with the intention of identifying functional groups. The purpose of this preliminary investigation is to identify changes, or lack thereof, to the functional groups on the surface of carbon fibres as a consequence of processing conditions, as opposed to the elucidation of the precise chemical structure of the sizing. The high-resolution spectra of carbon, oxygen, nitrogen and silicon obtained from virgin carbon fibres are presented in Figure 110, Figure 111, Figure 112 and Figure 113 respectively. 262PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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