Mechanisms of vapor permeation through multilayer barrier films: Lag time versus equilibrium permeation

被引:357
作者
Graff, GL [1 ]
Williford, RE [1 ]
Burrows, PE [1 ]
机构
[1] Pacific NW Natl Lab, Energy Sci & Technol Directorate, Richland, WA 99352 USA
关键词
D O I
10.1063/1.1768610
中图分类号
O59 [应用物理学];
学科分类号
摘要
Multilayer, thin-film organic/inorganic composite barrier layers have recently been reported to achieve water vapor permeation rates of <10(-5) g/m(2)/day at 25degreesC/40%RH on polyethylene terephthalate substrates. Using both transient and steady-state vapor permeation measurements combined with classical Fickian diffusion models, we determine the mechanism of vapor permeation through such barrier structures and show that results obtained to date are limited not by equilibrium diffusion but by lag-time effects caused by the extremely long effective path length for the diffusing gas. The implications for further improvement of flexible thin-film vapor barriers are discussed. (C) 2004 American Institute of Physics.
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收藏
页码:1840 / 1849
页数:10
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