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shown that ethanol may be responsible for swelling PEEK and GC-MS has been used to identify phenol derivatives, such as 2-ethylphenol, which may indicate that ethanol may undergo some decomposition and subsequently react with the phenyl ring. Further work is required to confirm this inference, but should the substituted phenols remain within the polymer matrix post production, the mass of solids removed would be greater than the initial mass. In addition, the percentage mass loss upon decomposition would increase and the thermal decomposition temperature observed by TGA would be reduced due to the degradation of the polymer structure. These effects are both observed in Figure 58 where it may be seen that the percentage mass loss after a 0 minute reaction is greater than that of a virgin PEEK 150CA30 sample, the onset of decomposition being identified at approximately 700 K. Differential Scanning Calorimetry Analysis Since DSC is able to identify the polymeric transitions, Tg, Tc and Tm, associated with PEEK it is possible to identify the presence of PEEK. Consequently the absence of PEEK may be used to indicate that the decomposition of the polymer chains has taken place. PEEK 150CA30 is received in the semi-crystalline state, therefore in the virgin sample only the Tg and Tm should be observed. Figure 59 shows the DSC thermograms for samples processed for 0 – 120 minutes. 195PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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