Abstract
The search for the Rehbinder effect in adhesive joints was attempted. The behavior of the fiber/polymer interface was studied for this purpose upon loading of joints directly in liquid media. The poly(arylene sulphone) and epoxy compound EDT-10 (based on DGEBA) were used as adhesives and carbon fibers and steel wire as adherents. The shear adhesive strength τ was measured by the pull-out technique at room temperature. The loading was made in air, hexane, poly(dimethylsiloxane), glycerol, water, alcohol and water/alcohol mixtures. It has been shown that liquids can decrease the interfacial strength, i.e. the Rehbinder effect takes place for adhesive joints also. The effect is very selective. It depends on the nature of both the polymer and the fiber. For example, the joints between EDT-10 and steel wire decrease their adhesive strength upon loading in polar liquids, whereas the presence of these liquids does not alter the adhesive strength of joints between EDT-10 and carbon fibers. No change of strength was found for poly(arylene sulphone)/fiber joints upon loading in liquids under investigation. Plausible explanations for the phenomenon observed are discussed.
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