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in composite materials. In addition, end-of-life PEEK may not retain the melt processing capability of the virgin material and may consequently require an alternative recycling process. This research focuses on the recycling of a PEEK composite, PEEK150CA30, filled with 30 %v carbon fibre. In light of this, previous work, as detailed in Chapter 2.2. Literature Review, has investigated the decomposition of PEEK in supercritical water (scH2O) in the presence of a sodium carbonate (Na2CO3) catalyst, with the polymer showing no decomposition at temperatures below 703 K [171]. The research presented herein was carried out using co-solvent systems comprising of alcohol and water, incorporating the use of a caesium carbonate catalyst (Cs2CO3). Unlike Na2CO3, Cs2CO3 is soluble in ethanol and propanol and, given that the carbonate functional group is responsible for the catalytic effect, substitution of Na2CO3 with Cs2CO3 facilitates the use of EtOH and PrOH as co-solvents. The use of co-solvents in combination with a catalyst is in an attempt to decompose PEEK close to its melting temperature of 616 K. These reactions were carried in the HTR owing to the high temperatures required. A constant solvent loading rate of 50 %v was used for all PEEK decomposition reactions, irrespective of the solvent composition, in combination with a constant PEEK15CA30 loading of 10 mg ml-1. Approximately 0.575g of PEEK150CA30 was accurately measured using a Sartorius Research R160P balance (Sartorius AG, Germany) and loaded into a stainless steel basket. The basket was attached to the agitator shaft, suspending the PEEK at the centreline of the reactor and therefore ensuring no contact with the reactor wall was made during the 89PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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