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- W2077326021 abstract "Micrography and infrared spectroscopy were applied to explore microstructural stabilization of mesophase pitch at oxidation temperatures as low as 130 °C. AR mesophase pitch synthesized from naphthalene was drawn to rods and thick filaments with fine fibrous microstructures that coarsen upon carbonization without adequate stabilization. At 270 °C, the stabilization front advances rapidly to a depth of about 7 μm, after which no further growth is perceptible. At low temperatures, there is a time lag before a stabilized layer can be observed near the surface, but thereafter the stabilization front advances relatively rapidly. For longer oxidation times, the low-temperature stabilization depths can exceed those attained at higher temperatures. FTIR spectra confirmed chemical reactivity and the formation of oxygen-bearing functional groups even at the low oxidation temperatures. Oxidation under a moderate pressure of 0.7 MPa can be effective in raising the oxygen uptake and increasing the stabilization depths significantly. All evidences point to the advantageous use of lower oxidative temperatures: more effective penetration of stabilization depth, lessen destructive effects of over-oxidation, and potentially shorter processing times." @default.
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- W2077326021 date "2005-01-01" @default.
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- W2077326021 title "Injection and stabilization of mesophase pitch in the fabrication of carbon–carbon composites. Part III: Mesophase stabilization at low temperatures and elevated oxidation pressures" @default.
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- W2077326021 doi "https://doi.org/10.1016/j.carbon.2004.08.032" @default.
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