Synchronous effects of multiscale reinforced and toughened CFRP composites by MWNTs-EP/PSF hybrid nanofibers with preferred orientation |
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| Affiliation: | 1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, PR China;2. Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Beijing 100029, PR China;1. School of Materials, University of Manchester, Manchester M13 9PL, UK;2. Royal Holloway, University of London, Surrey TW20 0EX, UK;1. School of Engineering and Materials Science, 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;1. Ghent University, Department of Textiles, Technologiepark-Zwijnaarde 907, B-9052 Zwijnaarde, Belgium;2. Ghent University, Department of Materials Science and Engineering, Technologiepark-Zwijnaarde 903, B-9052 Zwijnaarde, Belgium;3. Vrije Universiteit Brussel, Department Materials and Chemistry, Pleinlaan 2, B-1050 Brussels, Belgium;1. Revolution Fibres, 9a Corban Ave, Henderson, Auckland 0612, New Zealand;2. School of Engineering, University of Waikato, Private Bag 3105, Hamilton, New Zealand;1. Department of Textiles, Ghent University, Technologiepark-Zwijnaarde 907, B-9052 Zwijnaarde, Belgium;2. Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, B-9052 Zwijnaarde, Belgium;3. Department Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium |
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| Abstract: | MWNTs-EP/PSF (polysulfone) hybrid nanofibers with preferred orientation were directly electrospun onto carbon fiber/epoxy prepregs and interlaminar synchronously reinforced and toughened CFRP composites were successfully fabricated. With MWNTs-EP loading increasing, the oriented nanofibers were obtained accompanying with enhanced alignment of inner MWNTs-EP. Flexural properties and interlaminar shear strength of composites were improved with increasing MWNTs-EP loadings, whereas fracture toughness attained maximum at 10 wt% MWNTs-EP loading and then decreased. Based on these results, multiscale schematic modeling and mechanism schematic of hybrid nanofibers reinforced and toughened composites were suggested. Due to the preferred orientation of nanofibers, MWNTs-EP was inclined to align vertically to carbon fiber direction along the in-plane of interface layer. The proposed network structures, containing four correlative phases of MWNTs-EP/PSF sphere/carbon fiber/epoxy matrix, contributed to simultaneous improvement of strength and toughness of composites, which was realized by crack pinning, crack deflection, crack bridging and effective load transfer. |
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| Keywords: | A Prepreg B Fracture toughness B Microstructure Carbon nanotubes |
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