Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 583, Issue -, Pages 13-23Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.09.005
Keywords
Carbon fibers; Polymer-matrix composites; Interface/interphase; Rigid-flexible structure
Categories
Funding
- Natural Science Foundation of China [51803102, 51903129]
- Natural Science Foundation of Shandong Province [201807070028, 201808220020]
- Source Innovation Project of Qingdao [19-6-2-75-cg]
- Industry and Education Cooperation Program of The Ministry of Education [201802201002, 201901078008, 201802230009]
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Different rigid-flexible structures were studied to understand their influence on the interface strength of carbon fiber/epoxy composites. The optimal interfacial shear strength and interlaminar shear strength were 86.7 MPa and 85.4 MPa, respectively, with a polymerization time of 12 hours. The impact toughness and tensile strength of the composites increased with polymerization time growth, while the conductivity decreased.
In order to comprehend the influence of different rigid-flexible structures on the interface strength of carbon fiber(CF)/epoxy composites, CNTs was firstly chemically grafted on CFs surface, and then polyamide (PA) was grafted onto CF-CNTs surface through varying anionic polymerization time of caprolactam [CF-CNTs-PAn (n = 6 h, 12 h, 24 h)]. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy indicated the successful establishment of CNTs and PA. TGA demonstrated the different grafting amounts of CF-CNTs-PAn (n = 6 h, 12 h and 24 h). SEM images revealed a compactness and uniform coverage of the CNTs/PA, with increasing polymerization time, the CF and CNTs surface was covered by a thick layer of PA. The surface energy increased and then decreased. The optimal interfacial shear strength (IFSS) and interlaminar shear strength (ILSS) of the CF/epoxy composites with a polymerization time of 12 h (CF-CNTs-PA12h) was 86.7 and 85.4 MPa, which was 77.6% and 45.7% higher than that of untreated CF/epoxy composite. As the polymerization time grew, the impact toughness and tensile strength of CF/epoxy composites enhanced and conductivity of CF/epoxy composite reduced. In addition, the mechanisms of reinforcement and toughening were also illuminated. This work would provide a certain theoretical basis for the preparation and applications of high-performance CF composites with different structures. (C) 2020 Elsevier Inc. All rights reserved.
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