Abstract
Carbon microfiber was prepared through shear pulverization using the self-designed pan-mill type equipment at ambient temperature from short carbon fiber (CF). The effects of shear stress on structure transformations, particles size, microfiber morphology, surface functional groups and crystalline properties during pulverization were studied by laser diffraction particle size analyzer, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), x-ray photoelectron spectroscopy (XPS) and wide-angle x-ray diffraction (WAXD), respectively. SEM analysis indicated that CF was milled into microfiber due to the strong shear and squeezing force. The average particle size of carbon microfiber was reduced to 12.7 μm and specific surface area was increased to 0.6 m2/g after 40 milling cycles. FT-IR and XPS analyses showed that the oxygen-containing groups increased after shear pulverization, and WAXD results illustrated that shear stress offered by mill discs had an obvious damage on the crystal structure of CF, leading to a decrease of crystallinity. Thermal analysis showed that carbon microfiber exhibited good thermal stability. The pan-milling shear pulverization technique is an environment-friendly and efficient method for preparing carbon microfiber.
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Shi, F., Lu, C. & Liang, M. Preparation and Characterization of Carbon Microfiber Through Shear Pulverization Using Pan-Mill Equipment. J. of Materi Eng and Perform 19, 643–649 (2010). https://doi.org/10.1007/s11665-009-9528-1
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DOI: https://doi.org/10.1007/s11665-009-9528-1