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the reaction time to 120 minutes leads to the complete decomposition of the polymer matrix, the absence of any observable polymer transitions by DSC and a complete departure from the polymer decomposition temperature when analysed by TGA as shown in Figure 66. 110 100 90 80 70 60 50 Virgin PEEK150CA30 tr = 0 min tr = 30 min tr = 60 min tr = 120 min 400 600 800 1000 1200 Temperature (K) Figure 66: Thermogravimetric analysis of recovered solids according to reaction time, tr = 0 - 120 min, [PrOH] = 20 %v, [H2O] = 80 %v, [Cs2CO3] = 10 mg ml-1, T = 623 K, P = 16.4 ± 0.2 MPa Inspection of Figure 66 shows that the mass loss observed when the reaction time is 0 minutes is greater than the virgin PEEK150CA30 sample, and therefore the sample has acquired mass. This is consistent with the findings when a water / ethanol system is employed and is a result of the partial decomposition and subsequent reaction of the alcohol with the polymer matrix [318]. This effect is further evidenced by the reduction in the decomposition temperature of the remaining sample. That exception aside, it is observed that the mass loss by TGA is inversely proportional to the reaction time. Given that 205 Mass (%)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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