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that the decomposition process may differ between literature sources. As well as the stresses induced by the ingress of water, or other solvents, into the polymer matrix, external stresses are applied to many epoxy resins during their in-service life particularly when used to form composite materials or coatings. Analysis of load-induced stresses on aged epoxy resin coating, applied to a metallic plate, by Electrochemical Impedance Spectroscopy (EIS) has been carried out, showing that the uptake of water is proportional to the degree of ageing and inversely proportional to the load applied [158]. The findings from studies on ageing may be applicable to the recycling process, depending on the recycling technology used. For example, diffusivity studies may be instrumental when considering solvolysis processes but may be less influential when pyrolysis is used. The decomposition of a BADGE based epoxy resin is a consideration for many high performance applications, such as the nuclear industry, and consequently the decomposition process has been studied and reported as one of hydrothermal oxidation, requiring 683 K and 24 MPa [159]. Experiments in sub-critical water (533 – 573 K, 3 MPa) have shown that the temperature and reaction time are of the most important factors [160], consistent with expectation considering kinetic and thermodynamic principles. Specific applications require epoxy resins to exhibit fire resistance, often achieved by the use of halogenated compounds. The performance of fire resistance epoxy resins has therefore been a topic of interest and, since fire retardation is essentially the ability to resist thermal decompositions, it is incorporated into the general study of decomposition reactions [161]. Kinetic studies of the thermal decomposition of cured epoxy resins, 49PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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