Abstract
Ethylene-vinyl acetate copolymers containing 4, 11, and 19 wt. % of vinyl acetate (VAc), polyethylene, and poly(vinyl acetate) were investigated by the two-liquid contact-angle method at 20°C. The dispersion force component of surface free energy γ increased drastically with the increase of VAc content, and deviated largely from the additivity law in regards of the surface area fractions of ethylene and VAc. On the other hand, the nondispersive (i.e., mainly due to hydrogen bonding) interaction free energy between solid and water I increased linearly with the concentration of VAc on the surface.
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