The interfacial adhesion of recycled carbon fiber (CF) reinforced epoxy composite heated\nby microwave (MW) irradiation were investigated by changing the curing state of the epoxy resin.\nThe recycled CF was recovered from the composite, which was prepared by vacuum-assisted resin\ntransfer molding, by thermal degradation at 500 or 600 ââ??¦C. Thermogravimetric analysis showed\nthat the heating at 600 ââ??¦C caused rough damage to the CF surface, whereas recycled CF recovered\nat 500 ââ??¦C have few defects. The interfacial shear strength (IFSS) between recycled CF and epoxy\nresin was measured by a single-fiber fragmentation test. The test specimen was heated by MW after\nmixing the epoxy resin with a curing agent or pre-curing, in order to investigate the curing effects\non the matrix resin. The IFSSs of the MW-irradiated samples were significantly varied by the curing\nstate of the epoxy resin and the surface condition of recycled CF, resulting that they were 99.5 to\n131.7% of oven heated samples Furthermore, rheological measurements showed that the viscosity\nand shrinking behaviors of epoxy resin were affected based on the curing state of epoxy resin before\nMW irradiation.
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