A new method for preparation of functionalized graphene and its epoxy nanocomposites
Date
2020
Authors
Naeem, M.
Kuan, H.C.
Michelmore, A.
Meng, Q.
Qiu, A.
Aakyiir, M.
Losic, D.
Zhu, S.
Ma, J.
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Journal article
Citation
Composites Part B: Engineering, 2020; 196:108096-1-108096-10
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Mohannad Naeem, Hsu-Chiang Kuan, Andrew Michelmore, Qingshi Meng, Aidong Qiu ... Dusan Losic ... et al.
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Abstract
Organic solvents are often used to prepare epoxy/graphene nanocomposites. In this study a graphene precursor is developed, which in epoxy at 200 °C is able to directly exfoliate into three classes of graphene platelets: large, single-layer sheets, medium sized sheets with 5.2 ± 1.95 nm in thickness, and smaller 0.5–1.0 nm thick sheets of 200–500 nm in lateral dimension, with a Raman ID/IG ratio of 0.177. The yield of single-layer graphene is 41.45%. Due to oxygen-containing groups on the surface, these sheets are named functionalized graphene platelets. Platelet films of ~10 μm in thickness have an electrical conductivity of 978.65 ± 79.44 S/cm. A percolation threshold of electrical conductivity is observed at 0.80 vol% for epoxy/graphene nanocomposites. The composites show highly improved mechanical and dynamic thermo-mechanical properties. At 1.03 vol%, the nanocomposite has a fracture energy release rate of 850.78 ± 58.00 J m−2 corresponding to an increase of 170.61% over neat epoxy.
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© 2020 Elsevier Ltd. All rights reserved.