Abstract
The surface characteristics of ethylene–vinyl acetate (EVA) were modified by argon, air, and oxygen plasma at atmospheric pressure. The surface energies of the EVA were evaluated by contact angles according to a sessile-drop method and adhesion energy ( G IC) was estimated by a 180° peel test with polyurethane (PU). After the plasma treatments, the surface free energies (or specific polar component) of the EVA increased about five times compared to that of virgin EVA. The adhesion between the EVA and the PU is significantly improved by the plasma treatment. Especially, Ar/air/O 2 plasma treatment increases G IC of EVA/PU up to about 600% compared to that of the sample using virgin EVA.
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