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Barrier Properties of PLA to Water Vapour: Effect of Temperature and Morphology
Giuliana Gorrasi,Rosaria Anastasio,Laura Bassi,Roberto Pantani 한국고분자학회 2013 Macromolecular Research Vol.21 No.10
In this paper the barrier properties to water vapour of polylactic acid (PLA) films prepared with different thermal treatments were analyzed with the aim of correlating them to the morphology of the samples. The crystallization kinetics of the material was assessed during isothermal steps reached after cooling from the melt or heating from the solid. The temperature at which the maximum crystallization rate was attained was selected as the crystallization temperature for the samples analyzed for barrier properties. The structural and morphological organization was analyzed by means of X-ray diffraction analysis, differential thermal analysis (DSC) and optical analysis. Sorption and diffusion experiments were conducted either varying the temperature or the morphology of the samples. It was found that sorption was mainly dependent on the amount of the permeable non crystalline phase, while diffusion was also dependent on the morphological organization of the crystalline domains.
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