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a.) b.) c.) d.) Figure 103: SEM micrographs for decomposition in scPrOH as a function of reaction time. [PrOH] = 100 %, [Cs2CO3] = 10 mg ml-1, T = 573 K; a.) t = 30 min, Mag = 250x, WD = 8.4; b.) t = 30 min, Mag 800x, WD = 8.4; c.) t = 45 min, Mag = 85x, WD 10.2; d.) t = 45 min, Mag 500x, WD = 10.2 Figure 103 ‘a’ shows that after 30 minutes under reaction conditions areas of the polymer have undergone swelling. The initial surface fractures are still visible in many regions but the dominant process is now the swelling of the bulk polymer, a process that out-paces the expansion capabilities of the surface and leads to peeling. Unlike the surface fractures identified at the start of the reaction, these peeling fissures are on the macro-scale and may span the entire surface of the polymer. As these fissures open they expose the sub-surface pores, which may in turn increase the mass transfer of material into and out of the polymer, thereby accelerating the process further. Where these fissures connect, rupture points are observed, possibly due to stress concentration. Ruptures of this type produce significant 251PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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