Oxygen diffusion in bilayer polymer films

Lars Poulsen, Ingo Zebger, Jannik Pentti Tofte, Markus Klinger, Ole Hassager, Peter R. Ogilby

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Experiments to quantify oxygen diffusion have been performed on polymer samples in which a film of poly(ethylene-co-norbornene) was cast onto a film of polystyrene which, in turn, was cast onto an oxygen-impermeable substrate. In the technique employed, the time evolution of oxygen transport through the film of poly(ethylene-co-norbornene) and into the polystyrene film was monitored using the phosphorescence of singlet oxygen as a spectroscopic probe. To analyze the data, it was necessary to solve Fick's second law of diffusion for both polymer films. Tractable analytical and numerical solutions were obtained for the problem. Moreover, the numerical solution is sufficiently general that it can be used to simulate oxygen concentration profiles in films consisting of more than two layers. Data obtained from the bilayer films yield a diffusion coefficient for oxygen in poly(ethylene-co-norbornene) that is consistent with diffusion coefficients independently obtained from monolayer films and bulk samples.
Original languageEnglish
JournalJournal of Physical Chemistry Part B: Condensed Matter, Materials, Surfaces, Interfaces & Biophysical
Volume107
Issue number50
Pages (from-to)13885-13891
ISSN1520-6106
DOIs
Publication statusPublished - 2004

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