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MrDDS =248.3gmol-1,MDER =30g,NS =4,EEW=176 MDDS =248.3×30=11.279g 4 176 This calculation allows for a stoichiometric mixture of DER 332 and DDS. However, it is prudent to add the DDS in slight excess to ensure the absence of unreacted DER 332, the effects of which were discussed in Chapter 2.3. An excess of 5 % was used for all experiments. Having obtained the required masses of DER 332 and DDS, the DER 332 was heated to 373 K using a Clifton Hotplate Stirrer (Nickel-Electro LTD, UK). A magnetic stirrer was used to distribute the heat throughout the sample, the temperature was monitored by means of a thermometer (Brannan, UK) (accuracy, ± 1 K at 308 K). With the temperature of the DER 332 maintained between 373 and 393 K, the DDS was added to the beaker under stirring. After approximately 45 minutes the mixture was sufficiently mixed, indicated by transparency of the fluid. The viscous fluid was transferred to the aluminium mould (110 mm x 85 mm) and immediately placed in a pre-heated muffle furnace (Sanyo Gallenkamp Plc, UK) at 393 K to prevent cooling of the resin. The resin was then cured, starting with an initial heating rate of 1 K min-1, according to the curing cycle shown in Figure 7. 97PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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