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6 5 4 3 2 1 0 PEEK150PF PEEK450PF PEEK150CA30 PEEK450CA30 0 50 100 150 200 250 300 Lag Time (min) Figure 43: Mass loss observed by TGA as a function of Lag Time for PEEK processed with scCO2, P = 20.0 MPa, T = 413 K, t = 30 min Figure 43 shows that in general, the mass loss observed by TGA is inversely proportional to the Lag Time, indicating that the CO2 escapes from the polymer under ambient conditions. The control samples showed a mass loss of 0.25 % when analysed by TGA, thought to be attributable to experimental error. The responses of PEEK 150PF and 450PF are similar to each other, as are the responses from PEEK 150CA30 and 450CA30. It is evident that the carbon fibres contained within the PEEK 150CA30 and 450CA30 grades contribute to the release of CO2, and hence the mass loss observed by carbon fibre filled samples was lower than that of their unfilled counterparts. It is possible that in the case of carbon fibre filled PEEK samples that the uptake of CO2 into the polymer matrix was lower than that of the unfilled PEEK, which in turn would result in a lower percentage mass loss observed by TGA. However, given that the sample is 30 %v carbon fibre, the majority of the sample consists of the polymer matrix and therefore 70 %v of the sample would be expected to behave in a 173 Mass Loss Observed by TGA (%)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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