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CHAPTER 5. RESULTS PART B: DECOMPOSITION AND RECYCLING OF POLYEPOXIDE THERMOSET RESIN 5.1. SOLVOLYSIS OF EPOXY RESIN IN SUPERCRITICAL ALCOHOLS A 2,2-Bis[4-(glycidyloxy)phenyl]propane (BAGDE) based polyepoxide thermoset resin was prepared as detailed in Chapter 3.3.3. and was subsequently used for the investigation into the decomposition of high-performance thermoset polymers using supercritical fluids. As was the case with the studies of PEEK, caesium carbonate was utilised as a catalyst in conjunction with ethanol and propanol as co-solvents with water. A limited study employing butanol (BuOH) as a co-solvent is also presented. The format of this results chapter follows that of the experimental methodology, starting with the control sample before investigating the effects of the co-solvent concentration, catalyst concentration and reaction time. Given their differences, each of the solvents is investigated separately prior to completing a comparative study and drawing conclusions. Control sample Control samples and samples required to undergo reaction were produced in an identical way as detailed in Chapter 3.3.3. an example of which is provided in Figure 74. The control samples, processed with water in the absence of a co-solvent or catalyst, show a mean mass loss of 7.7 % with a standard deviation (SD) of 0.92. The mean phenol concentration, determined quantitatively by HPLC, was 1.89 mg ml-1 with an SD of 0.24. It may therefore be inferred that whilst processing with water alone at 573 K does cause the samples to show 216PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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