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In this study, we present a new approach to modify the surface of Kevlar‐29 fiber by the complexation. The surface of Kevlar‐29 fiber was treated by calcium chloride (CaCl2) ethanol solution. The structure and morphology of the modified Kevlar‐29 fiber were characterized by Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction instrument, atomic force microscopy, and scanning electron microscopy. The results showed that CaCl2 treatment's method can cause changes of the chemical groups of Kevlar‐29 fiber. The amino‐groups of Kevlar‐29 fiber were freed and the contents of ‐C‐N‐ increased. The changes can improve the surface roughness of Kevlar‐29 fibers. This can increase the adhesive of Kevlar fiber/epoxy composites. From the ILSS and mechanical properties values, it can be concluded that treatment with 5 wt % CaCl2 for 5 h is the optimum complexation condition.
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Li et al. (2014) studied this question.
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