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and optical microscopy. A detailed explanation of the method of analysis for each technique is given in Chapter 3.4.3. 3.3.3. Decomposition and Recycling of Polyepoxide Thermoset Resin A model polyepoxide resin, 2,2-bis[4-(glycidyloxy)phenyl]propane (DER 332, BADGE, DGEBA), was used to study the effects of a co-solvent system on the decomposition of a thermoset resin. By using this model resin, the objective was to transfer the knowledge gained to the study of composite materials. Carrying out this investigation in the absence of carbon fibres allows for the study of the decomposition reactions without the mass-transfer effects provided by the carbon fibres and prevents any potential interference of the carbon fibre sizing. Having previously discussed the application of co-solvents with respect to the decomposition of a high-performance thermoplastic composite materials (PEEK, see Chapter 3.3.2) water, ethanol and propanol were chosen as the initial solvents for this study. A fourth solvent, butanol, was also introduced to carryout a limited investigation into the effect of the carbon chain length on the decomposition reactions. The format of this investigation follows that of the PEEK decomposition reactions, starting with the effects of the co-solvent concentration [R-OH] followed by the effects of the catalyst concentration [Cs2CO3] before focussing on the effects of the reaction time (tr). The investigation into the effect of the carbon chain length focussed only on the effect of [R-OH] and is therefore presented separately. The preparation of the BADGE based epoxy resin was identical for all reactions and will be presented prior to the decomposition reactions. 95PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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