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The designed experiment, given in the reaction schedule Chapter 3.3.1, was analysed using Minitab ® 16 statistical analysis software. Figure 37 shows the effect of the CO2 processing pressure on the glass transition temperature (Tg). 416 414 412 410 408 406 404 402 400 Point Type Corner Center 5 10 15 Processing pressure (MPa) Figure 37: Main effects plot for influence of CO2 processing pressure on glass transition temperature (Tg), T = 413 - 453 K, tr = 10 - 30 min Inspection of Figure 37 shows that the average glass transition temperature of PEEK decreases with increasing CO2 pressure, within the range of 5 – 15 MPa, for processing temperatures of 413 – 453 K and processing times of up to 30 minutes. The Tg of PEEK as received is 416 K and therefore it may be seen from inspection of the reaction schedule, Chapter 3.3.1, that the majority of the processing conditions take place above the Tg. Processing above the Tg allows the permeation of the scCO2 through the polymer matrix and facilitates the materialisation of the plasticisation effects of scCO2. This plasticisation effect can also have an impact on the crystallisation of PEEK and is most evident when samples that are initially amorphous are used. The methodology for generating amorphous PEEK samples is provided in detail in Chapter 3.3.1, and the confirmation of their amorphicity is 162 Mean Tg (K)PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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