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The viability of applying this methodology to high-performance thermoplastics has been investigated using PEEK as an example [271]. Whilst PEEK has a high impact resistance and exceptional wear properties, especially when reinforced with carbon fibre, it is possible to produced < 5μm particles with a narrow particle distribution when carried out a low temperatures [272]. In the case of PEEK an additional complication arises in that the cost of the polymer is many times that of the carbon fibres within it. Although PEEK is a thermoplastic, and therefore may be melt processed, conditions exist where melt processing is not a viable recycling option as discussed in Chapter 2.3. Many of those scenarios involve changes to the chemical structure of PEEK and therefore comminution, since it does not chemically alter the material, may not be a viable recycling route. Comminution - High-Voltage Fragmentation High-Voltage (HV) Fragmentation is a process utilised in the mining industry to separate minerals from ores, allowing for the efficient recovery of valuable components [273]. Rock samples to be fragmented are typically place in a water bath and subjected to high voltage pulses of electricity, which may be > 100 kV, causing comminution of the rock and liberation of the desired mineral [274]. The geometry of the target influences the efficiency of the process, as does the target’s ability to dissipate energy [275]. Although still in its infancy, research into this technology has been applied to the recycling of waste or end-of-life PCB’s, which often contain polyepoxide resins as well as precious and valuable metals [276]. By extension, this technique has been directly applied to epoxy resins and has been demonstrated to efficiently fragment the polymer matrix [277]. Research into the 67PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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