Functionalized reduced graphene oxide/epoxy composites with enhanced mechanical properties and thermal stability |
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| Affiliation: | 1. Surface Engineering and Tribology Division, Council of Scientific and Industrial Research-Central Mechanical Engineering Research Institute, Durgapur 713209, India;2. Academy of Scientific and Innovative Research (AcSIR), CSIR-CMERI, Campus, Durgapur 713209, India;1. School of Engineering and Materials Science, and Materials Research Institute, Queen Mary University of London, Mile End Road, E1 4NS, London, UK;2. Nanoforce Technology Ltd., Joseph Priestley Building, Queen Mary University of London, Mile End Road, E1 4NS, London, UK;3. NetComposites Ltd., Unit 4a, Broom Business Park, Bridge Way, S41 9QG, Chesterfield, UK;4. BAE Systems MA&I, 20R Buckingham House, Filton, BS34 7QW, UK;1. Department of Material Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea;2. Department of Polymer Engineering, College of Engineering, University of Suwon, 17 Wauan-gil, Bongdam-eup, Hwaseong-si, Gyeonggi-do, 18323, Republic of Korea;1. Donghua University Center for Civil Aviation Composites, Donghua University, 2999 North Renmin Road, Shanghai, 201620, China;2. Key Laboratory of Textile Science &Technology, Ministry of Education, College of Textiles, Donghua University, 2999 North Renmin Road, Shanghai, 201620, China;3. CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230026, China;1. Key Laboratory of Advanced Technology for Specially Functional Materials of Ministry of Education, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;2. Department of Chemical Engineering and Materials Science, Composite Materials and Structures Center, Michigan State University, East Lansing, Michigan 48824-1226, USA |
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| Abstract: | One-pot hydrothermal reduction of graphene oxide (GO) in N-methyl-2-pyrrolidone (NMP) suspension was performed, wherein GO surface were functionalized by free radicals generated from NMP molecules. The NMP functionalized reduced GO (NMPG) nanosheets were then incorporated into epoxy matrix to prepare epoxy composites. The significant improvement of 100 and 240% in fracture toughness (critical intensity factor, KIC) and fracture energy (critical strain energy release rate, GIC) achieved from single edge notched bending (SENB) test revealed the excellent toughening ability of NMPG. The improved compatibility and interfacial interaction between the epoxy matrix and NMPG yielded∼28, 19 and 51% improvement in tensile strength, Young's and storage modulus, respectively. Thermal stability of pure epoxy and its composites was determined at 5, 10 and 50% weight loss, which showed 30, 27.5 and 29 °C improvement with 0.2 wt% NMPG loading. The work provides a simple method to prepare graphene-based epoxy composites with improved performance. |
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| Keywords: | Graphene Thermosetting resin Fracture toughness Thermomechanical properties Thermal analysis |
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