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Open AccessArticle

Curing Effects on Interfacial Adhesion between Recycled Carbon Fiber and Epoxy Resin Heated by Microwave Irradiation

National Institute of Advanced Industrial Science and Technology (AIST), Shimosidami, Moriyama-ku, Nagoya 463-8560, Japan
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Materials 2018, 11(4), 493; https://doi.org/10.3390/ma11040493
Received: 8 March 2018 / Revised: 22 March 2018 / Accepted: 23 March 2018 / Published: 26 March 2018
(This article belongs to the Special Issue Carbon Fibers and Their Composite Materials)
The interfacial adhesion of recycled carbon fiber (CF) reinforced epoxy composite heated by microwave (MW) irradiation were investigated by changing the curing state of the epoxy resin. The recycled CF was recovered from the composite, which was prepared by vacuum-assisted resin transfer molding, by thermal degradation at 500 or 600 °C. Thermogravimetric analysis showed that the heating at 600 °C caused rough damage to the CF surface, whereas recycled CF recovered at 500 °C have few defects. The interfacial shear strength (IFSS) between recycled CF and epoxy resin was measured by a single-fiber fragmentation test. The test specimen was heated by MW after mixing the epoxy resin with a curing agent or pre-curing, in order to investigate the curing effects on the matrix resin. The IFSSs of the MW-irradiated samples were significantly varied by the curing state of the epoxy resin and the surface condition of recycled CF, resulting that they were 99.5 to 131.7% of oven heated samples Furthermore, rheological measurements showed that the viscosity and shrinking behaviors of epoxy resin were affected based on the curing state of epoxy resin before MW irradiation. View Full-Text
Keywords: interfacial adhesion; recycled carbon fiber; microwave heating; epoxy curing interfacial adhesion; recycled carbon fiber; microwave heating; epoxy curing
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MDPI and ACS Style

Tominaga, Y.; Shimamoto, D.; Hotta, Y. Curing Effects on Interfacial Adhesion between Recycled Carbon Fiber and Epoxy Resin Heated by Microwave Irradiation. Materials 2018, 11, 493.

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