RETRACTED ARTICLE: Surface modification of aramid fibers with novel chemical approach |
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Authors: | Tie-Min Liu Yuan-Suo Zheng Jie Hu |
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Affiliation: | (1) School of Material Science and Engineering, Xi’an Jiao Tong University, Xi’an, Shaanxi, 710049, People’s Republic of China;(2) School of Science, Xi’an Jiao Tong University, Xi’an, Shaanxi, 710049, People’s Republic of China |
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Abstract: | Friedel–Crafts Reaction as a simple and convenient approach to the surface modification of aramid fiber was introduced in this paper. Epoxy chloropropane
was chosen as the treatment reagent to modify aramid fibers surface via Graft reaction. After the modification, the interfacial properties of aramid/epoxy composites were investigated by the single fiber pull-out
test (SFP), and the mechanical properties of aramid fibers were investigated by the tensile strength test. The results showed
that the interfacial shear strength (IFSS) value of aramid/epoxy composites was enhanced by about 50%, and the tensile strength
of aramid fibers had no obvious damage. The crystalline state of aramid fibers was determined by X-ray diffraction instrument
(XRD), and the results showed that there were not any distinct crystal type varieties. The surface elements of aramid fibers
were determined by X-ray photoelectron spectroscopy (XPS), the analysis of which showed that the oxygen/carbon ratio of aramid
fiber surface increased obviously. The possible changes of the chemical structure of aramid fibers were investigated via Fourier
transform infrared spectrum (FTIR), and the analysis of which showed that the epoxy functional groups were grafted into the
molecule structure of aramid fibers. The surface morphology of aramid fibers was analyzed by Scanning electron microscope
(SEM), and the SEM results showed that the physical structure of aramid fibers was not etched or damaged obviously. The surface
energy of aramid fibers was investigated via the dynamic capillary method, and the results showed that the surface energy
was enhanced by 31.5%, and then the wettability degree of aramid fiber surface was enhanced obviously too. All of the results
indicated that this novel chemical modification approach not only can improve the interfacial bonding strength of aramid/epoxy
composites remarkably, but also have no negative influence on the intrinsic tensile strength of aramid fibers. |
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