The role of grafting force and surface wettability in interfacial enhancement of carbon nanotube/carbon fiber hierarchical composites |
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| Affiliation: | 1. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China;2. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;1. Centre for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, PR China;2. School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, PR China;3. State Key Lab of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, PR China;4. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China;5. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, PR China;1. Department of Aeronautics and Astronautics, MIT 77 Mass. Ave., Bldg. 35-220, USA;2. Department of Materials & Interfaces, Weizmann Institute of Science, Rehovot 76100, Israel;3. Department of Aeronautics and Astronautics, MIT 77 Mass. Ave., Bldg. 33-408, USA;1. School of Materials Science and Engineering, Shandong University, Jinan, People''s Republic of China;2. School of Materials Science and Engineering, Shandong University of Science and Technology, 266590 Qingdao, People''s Republic of China;1. Department of Engineering Science and Mechanics, Virginia Tech, Blacksburg, VA 24061, USA;2. Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM 87131, USA;1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China;2. Carbon Fiber Engineering Research Center, School of Materials Science and Engineering, Shandong University, Jinan 250061, China;3. CNGC Institute 53, Jinan 250031, China |
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| Abstract: | The grafting force of carbon nanotube (CNT) on carbon fiber (CF) and the wettability of CF surface were experimentally studied, where hierarchical CNT/CF reinforcement was prepared using chemical vapor deposition (CVD). Then, their effects on interfacial improvement were experimentally and theoretically investigated. The results show that the CNT/CF grafting force is so strong, more than 5 μN, and CNT/CF attachment can sustain the fracture of the CNTs. This is expected to be contributed to the improvement of interfacial properties. However, the deposited catalyst deteriorates the wettability, which could seriously degrade the interfacial properties. As a result, experimental results from the micro-droplet test show that there is only a 30% increase in the interfacial shear strength of hierarchical CNT/CF reinforced composite comparing with that of as-received CF reinforced composite. An analytical model was developed to predict the effects of CNT/CF grafting force on interfacial improvement, and the predicted results are in agreement with the experimental one. |
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