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All of the products shown in the proposed reaction scheme for the accelerated decomposition of PEEK, Figure 60, were observed by GC-MS with the exception of diphenylmethanone (2). Given that the ketone group is surrounded by 2 phenoxy groups, the absence of diphenylmethanone (2) suggest that the dissociation energy of the ketone group is less than that of the ether linkage. The absence of diphenylmethanone (2) has been observed and reported in the thermal decomposition of PEEK [105]. The production of either 4-phenoxyphenol (1) or diphenylmethanone (2) would ultimately lead to the production of phenol (8, 10), and consequently phenol is a major product of the reaction. 4- Phenoxyphenol (1) undergoes secondary reactions leading to the formation of 1-methyl-3- (4-methylphenoxy)benzene (3) which may undergo further reaction to form dibenzofuran (6) by radical addition [317]. The decomposition of dibenzofuran (6) to form 2-ethyl furan (9) is not thought to be dominant and is most often observed when the concentration of ethanol is 100 %. A competing reaction for the decomposition of 1-methyl-3-(4-methylphenoxy)benzene (3) is the formation of 4-methylphenol (7), which may undergo subsequent decomposition into phenol (10). Phenol was identified in all samples where the ethanol concentration was less than 100 %. Moreover, when the ethanol concentration was 100 % the production of phenol was not identified by GC-MS irrespective of the Cs2CO3 concentration and the reaction time. It may be deduced therefore, that phenol is a major product of the decomposition of PEEK near its melting temperature and that, whilst ethanol works effectively as a co-solvent for the reaction system, the predominant reaction mechanism is one of hydrolysis. 198PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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