Effect of grafting alkoxysilane on the surface properties of Kevlar fiber

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Abstract
This research applied the methodology of metalation and grafting alkoxysilane to modify the surface of Kevlar‐29 fiber. The surface properties of the modified Kevlar fiber were characterized by scanning electron microscopy, X‐ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, and Brunauer‐Emmett‐Teller isothermal adsorption analysis. The relationship between surface characteristics of Kevlar fiber and its interfacial adhesion of Kevlar fiber‐reinforced epoxy resin composites was also discussed. Compared with the untreated fiber, the surface of the modified Kevlar fiber was much rougher, its oxygen content increased by about 12%, the surface area enlarged about 10 times, and the wetting behavior improved. Due to the modification of the fiber, the adhesion between the fiber and the resin matrix was markedly improved and the Interlaminar Shear Strength of its epoxy composites increased by about 57%. POLYM. COMPOS. 28:412–416, 2007. © 2007 Society of Plastics Engineers.

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