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similar way to its unfilled counterpart. An alternative hypothesis is that the boundary between the carbon fibre and the PEEK provides small channels through which the CO2 may travel preferentially, negating somewhat the more tortuous route through the polymer matrix. This hypothesis is supported by observation made from Figure 43 where it can be seen that the percentage mass loss is loosely linear for unfilled PEEK, whereas there is a step change after a lag time of 120 minutes for the carbon fibre filled grades. This step change is thought to be the result of two effusion rates of CO2 from the sample. The primary route is via the channels formed by the presence of carbon fibres, the second route being via the polymer matrix. The offset in percentage mass loss between filled and unfilled PEEK, shown in Figure 43, results from the carbon fibre’s inability to absorb CO2. Therefore, for a given sample mass it is apparent that the carbon fibre filled sample will absorb, and therefore release, a lower mass of CO2. Since the PEEK samples were processed exclusively with CO2 it is possible to infer that the mass loss observed by TGA is a result of the release of CO2. To test this inference, the exhaust gas from the TGA was coupled to the FT-IR using a gas cyclone accessory as detailed in Chapeter 3.4.3. The TGA thermogram for PEEK 450PF processed with scCO2 are shown in Figure 44. 174PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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