The barrier properties of polyethylene terephthalate to mixtures of oxygen, carbon dioxide and nitrogen |
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| Authors: | E.L.V. LewisR.A. Duckett I.M. Ward J.P.A. FaircloughA.J. Ryan |
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| Affiliation: | a Department of Physics and Astronomy, IRC in Polymer Science and Technology, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
b Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK |
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| Abstract: | The diffusion and solubility of oxygen, nitrogen and carbon dioxide have been studied in amorphous and biaxially oriented films of polyethylene terephthalate (PET). To measure the sorption and desorption of each gas simultaneously in cases where mixtures of gases were studied, a mass spectrometer was used as a detector. It was found that the solubility and diffusion of nitrogen in PET were markedly affected by the presence of the other gases, oxygen and carbon dioxide with differences in detail between results for the amorphous and biaxially oriented films. It is of particular interest that the presence of oxygen reduces the solubility and increases the diffusivity of nitrogen. |
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| Keywords: | Permeability Mixed Gases PET |
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