Simultaneous in situ reduction,self-alignment and covalent bonding in graphene oxide/epoxy composites |
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| Affiliation: | 1. Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel;1. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan;2. Mitsubishi Gas Chem. Inc., Niijuku, Katsushika, Tokyo 125-8601, Japan;1. University Rey Juan Carlos, Materials Science and Engineering Area, C/Tulipán s/n, Móstoles, 28933 Madrid, Spain;2. Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-US, Américo Vespucio 49, 41092 Sevilla, Spain;1. Faculty of Physics, Vilnius University, Sauletekio 9, Vilnius LT-10222, Lithuania;2. Research Institute for Nuclear Problems of Belarusian State University, Bobruiskaya Str. 11, Minsk 220030 Belarus;3. Tomsk State University, 36 Lenin Prospekt, Tomsk 634050, Russian Federation;4. Ryazan State Radio Engineering University, 59/1 Gagarina Street, Ryazan 390005, Russian Federation;5. Physics Department, FUNDP - University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium;6. INFN-Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Italy;1. Science and Technology on Advanced Composites in Special Environments Laboratory, Harbin Institute of Technology, Harbin 150086, China;2. Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Tokyo 152-8552, Japan |
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| Abstract: | Graphene oxide (GO)/waterborne epoxy (EP) composites are prepared using an easy, all aqueous, in situ polymerization method. GO is reduced in situ using hydrazine to achieve highly stable reduced graphene oxide (rGO)/EP dispersions, leading to the formation of composites with a self-aligned layered structure and highly anisotropic properties between the direction of alignment and that perpendicular to it. The strong covalent bonding between the epoxy and rGO and the highly aligned, ultralarge rGO sheets give rise to a remarkable percolation threshold of 0.12 vol.%, as well as much improved mechanical, electrical and thermal properties of the composites in the alignment direction. They outperform those containing GO sheets that are bonded to the epoxy matrix through a weaker π–π stacking mechanism. |
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