Abstract
Aramid fibers were treated with oxygen plasma for the interfacial control in aramid fiber reinforced plastics (AFRP) with epoxy resin. Discussions were presented on the effects of oxygen plasma treatment time on the interfacial strength obtained from a single fiber pull-out test. The direct implantation of carboxyl group, hydroxyl group and carbonyl group on the aramid fiber surface by using the plasma treatment could be effective to improve the interfacial adhesion between aramid fiber and epoxy resin. And, the interfacial adhesion strength of aramid fiber varied by plasma treatment time was considerably increased or decreased. The adhesion state of epoxy resin onto the surface of aramid fiber after a single fiber pull-out test was investigated by scanning electron micrographs, and it was confirmed that the adhesion state was well after the plasma treatment. It was found that the low temperature plasma process was effective to control the interfacial adhesion between aramid fiber and epoxy resin.
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