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HPDSC Processing of PEEK Amorphous PEEK samples, typically having a mass of 10 mg, were subjected to scCO2 and analysed in-situ by means of high-pressure DSC. A Mettler Toledo HPDSC827e was used and has a maximum working pressure of 10 MPa. Amorphous samples contained within standard 40 μl aluminium DSC pans were placed inside the DSC with a second, empty, 40 μl Aluminium DSC pan used as a reference. The data were obtained directly from the Mettler Toledo STARe DSC software. Although this is polymer processing, since the analysis is performed in-situ the methods used are given as part of the analytical techniques in Chapter 3.4.2. Carbon Dioxide Containment within the Polymer Matrix PEEK samples were placed inside the LTR and the lid assembly was secured. The HAAKE temperature controller was activated and set to 413 K. Using the HIP pump the LTR was pressurised to 20.0 MPa, at which point the conditions were maintained for a period of 30 minutes. Once a period of 30 minutes under the processing conditions had elapsed the heating supply to the LTR was removed and the reactor allowed to cool to 323 K prior to depressurisation. A lag time, according to the experiment schedule given in Table 2, was allowed to elapse prior to analysis of the sample. 87PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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