Mild chemical recycling of aerospace fiber/epoxy composite wastes and utilization of the decomposed resin

Dissolution of epoxy thermosets via mild alcoholysis: the mechanism and kinetics study

“…5b shows that the ester bond at the most outside surface layer is about 70% of the bulk. According to the classical gel theory, [42][43][44] when the percentage of ester linkages drops lower than the gel point conversion, the oligomer or cluster gains sufficient mobility and diffuses into solvent. In a short time period, ester linkages in a very thin layer would effectively be cleaved and turned into segments with endcapped alcohol which can be nally be dissolved.…”

Recent History, Types, and Future of Modern Caisson Technology: The Way to More Sustainable Practices

“…High temperatures are required for performing recycling processes, which consume a large amount of energy [95] but less than that is required for making the virgin product.…”

“…There are mechanical and chemical methods as well as thermal methods for treating waste for recycling [97], which can be seen in Figure 18. Recycling of thermoset resins is harder than thermoplastic ones [95], but they are the most commonly used in composite materials [99]. This is why many methods are used and investigated.…”

Efficient reclamation of carbon fibers from epoxy composite waste through catalytic pyrolysis in molten ZnCl2

“…However, the performance of the bers was not characterized, and this degradation technique required a high pressure reaction vessel and a long reaction time. 17 Braun et al adopted tetralin and dihydroanthracene to degrade a carbon ber composite at 340 C for 2 h; the microstructures of the reclaimed bers showed no obvious defects and the tensile strength of the reclaimed bers was 3.95 GPa, which is approximately the same as that of the virgin carbon bers. 18 However, the formation conditions of the supercritical uid involved high temperature and high pressure.…”