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thermodynamically favourable alignment of the molecular chains, forming crystallites, and therefore the polymers produced are amorphous. The formation of crystallites, and therefore a semi-crystalline material, is extremely important for PEEK and has been studied extensively in the literature [71-75]. There is a dependence of PEEK’s physical properties on the molecular weight, such as the increase in shear viscosity with increasing molecular weight [76]. However, manipulation of certain physical properties of polymers is possible, to some extent, without altering the chemical structure of the polymer, blending, creating co-polymers or composites [77]. This is done through polymer processing, during which only physical changes to the material take place post-polymerisation. The solubility of scCO2 in polymers, both biodegradable and high- performance, has been an area of active research [27, 78]. Many industrially produced polymeric materials are low density foams. Research interests have often been centred around using scCO2 to foam biodegradable polymers such as polycaprolactone (PCL) and polylacticacid (PLA) [79-82]. The targeting of specific applications such as regenerative bone support structures using PLA foamed with scCO2 has also been explored [83]. The diffusion of scCO2 into functionalised PEEK has been studied in the literature [26], this research has investigated the effects of supercritical fluids, including scCO2, on the physical properties of un-modified PEEK. The processing parameters, such as temperature, CO2 pressure, processing time and cooling rate are important when processing PEEK. Although the crystallisation of PEEK is rapid, a strong dependence upon the cooling rate exists [84]. The crystallisation of PEEK readily takes place upon reaching the thermodynamic crystallisation temperature of approximately 449 K, although it can be shown that there is an effect of the 42PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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