Investigation of Interfacial and Mechanical Properties of Various Thermally-Recycled Carbon Fibers/Recycled PET Composites

• Published in: Fibers and polymers 2018, 19(8), , pp.1767-1775
• Main Authors: Baek, Yeong-Min, Shin, Pyeong-Su, Kim, Jong-Hyun, Park, Ha-Seung, Kwon, Dong-Jun, DeVries, K. Lawrence, Park, Joung-Man
• Format: Article
• Language: English
• Subjects: Carbon fiber reinforced plastics; Carbon fibers; Chemistry; Chemistry and Materials Science; Contact angle; Fiber composites; Industrial applications; Interfacial properties; Mechanical properties; Oxidation; Polyethylene terephthalate; Polymer matrix composites; Polymer Sciences; Tensile tests; 섬유공학
• ISSN: 1229-9197; 1875-0052
• DOI: 10.1007/s12221-018-8305-x

The mechanical and interfacial properties were evaluated for carbon fiber reinforced composites (CFRC) manufactured using thermally recycled waste carbon fiber and recycled polyethylene terephthalate (PET). The mechanical properties of the recycled fiber were determined and compared to those of neat fibers using the single-fiber tensile test. The surfaces of the recycled and neat carbon fiber were examined and compared using FE-SEM and dynamic contact angle measurements. A goal of the study was to determine the applicability of industrial use of recycled CF and/or recycled PET in CFRC. Mechanical properties were measured using short beam and tensile tests. These properties were observed to be correlated with crystallinity. The interfacial properties between the recycled carbon fibers and recycled PET were evaluated using the microdroplet test. At low temperature residual resin remained on the recycled CFs surface resulting relatively the low interfacial properties. At excessively high temperatures, oxidation occurred, on the CFs surface, which also resulting in relatively poor low mechanical properties. The optimal treatment condition was 500 °C, where the surface was relatively clean and the reduction in mechanical properties was minimized.