The interfacial strength and fracture characteristics of ethanol and polymer modified carbon nanotube fibers in their epoxy composites |
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| Affiliation: | 1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China;2. Suzhou Institute of Nano-Tech and Nano-Bionics, No. 398 Ruoshui Road, Suzhou 215123, China;1. Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA;2. Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Ruoshui Road 398, Suzhou 215123, China;1. Key Laboratory of Aerospace Advanced Materials and Performance, Department of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China;1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100190, China;2. Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, 22904-4746, USA;3. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China;4. Department of Mechanical Engineering, University of California, Riverside, CA, 92521, USA;5. School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK;6. Key Laboratory of Nano-Devices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China;1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China;2. Suzhou Institute of Nano-Tech and Nano-Bionics, No. 398 Ruoshui Road, Suzhou 215123, China;3. Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials, Beijing Aeronautical Science & Technology Research Institute of COMAC, Future Science and Technology Park, Changping District, Beijing 102211, China;1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, 27695, USA;3. Suzhou Institute of Nano-Tech and Nano-Bionics, Suzhou, 215213, China |
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| Abstract: | Carbon nanotube (CNT) fibers spun from CNT arrays were used as the reinforcement for epoxy composites, and the interfacial shear strength (IFSS) and fracture behavior were investigated by a single fiber fragmentation test. The IFSS between the CNT fiber and matrix strongly depended on the types of liquid introduced within the fiber. The IFSS of ethanol infiltrated CNT fiber/epoxy varied from 8.32 to 26.64 MPa among different spinning conditions. When long-molecule chain or cross-linked polymers were introduced, besides the increased fiber strength, the adhesion between the polymer modified fiber and the epoxy matrix was also significantly improved. Above all, the IFSS can be up to 120.32 MPa for a polyimide modified CNT fiber, one order of magnitude higher than that of ethanol infiltrated CNT fiber composites, and higher than those of typical carbon fiber/epoxy composites (e.g. 60–90 MPa). Moreover, the composite IFSS is proportional to the tensile strength and modulus of the CNT fiber, and decreases with increasing fiber diameter. The results demonstrate that the interfacial strength of the CNT fiber/epoxy can be significantly tuned by controlling the fiber structure and introducing polymer to optimize the tube–tube interactions within the fiber. |
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