Abstract
AbstractThe oxygen‐barrier properties of poly(lactic acid) (PLA)/poly(vinyl acetate‐co‐vinyl alcohol) [P(VAc‐co‐VA)] were investigated. P(VAc‐co‐VA)s with vinyl alcohol (VA) contents of 5, 10, and 15 mol % were prepared with the acid‐catalyzed hydrolysis of poly(vinyl acetate). The obtained copolymers with various contents of VA were blended with PLA at 5/95, 10/90, and 15/85 compositions. Films of the blends were prepared by a solution‐casting method with chloroform as the cosolvent. Although the blend with 5% VA in the copolymer appeared to be miscible, the blends with 10 and 15% VA content in the copolymer were immiscible, as verified by dynamic mechanical analysis. The oxygen‐barrier properties of the PLA films were enhanced when they were blended with P(VAc‐co‐VA). There was a reduction of about 40% in permeability with the addition of only 5% P(VAc‐co‐VA). The reduction in the permeability was more noticeable at higher VA contents. Also, the incorporation of P(VAc‐co‐VA) into PLA improved the elongation at break of the films significantly. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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