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Oxygen-barrier properties of poly(lactic acid)/poly(vinyl acetate-co-vinyl alcohol) blends as biodegradable films

Razavi, S. M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1002/app.36376
  3. Publisher: Wiley , 2012
  4. Abstract:
  5. The 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
  6. Keywords:
  7. Biodegradable ; Acid-catalyzed hydrolysis ; Biodegradable film ; Blends ; Cosolvents ; Elongation at break ; Gas permeation ; Oxygen barrier properties ; Polylactic acids ; Solution-casting method ; Vinylalcohol ; Copolymers ; Film preparation ; Films ; Lactic acid ; Oxygen ; Gas permeable membranes
  8. Source: Journal of Applied Polymer Science ; Volume 125, Issue SUPPL. 2 , September , 2012 , Pages E20-E26 ; 00218995 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/app.36376/abstract