Oxygen and water vapor gas barrier poly(ethylene naphthalate) films by deposition of SiOx plasma polymers from mixture of tetramethoxysilane and oxygen |
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Authors: | N. Inagaki V. Cech K. Narushima Y. Takechi |
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Affiliation: | 1. Laboratory of Polymer Chemistry, Faculty of Engineering, Shizuoka University, Hamamatsu 432‐8561, Japan;2. Institute of Materials Chemistry, Brno University of Technology, CZ‐612 00 Brno, Czech Republic |
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Abstract: | SiOx films were deposited from a mixture of tetramethoxysilane (TMOS) and oxygen on poly(ethylene 2,6‐naphthalate) film using ion‐assisted plasma polymerization technique (Method II) and conventional plasma polymerization technique (Method I), and were compared in chemical composition and gas barrier properties. Methods I and II were different in electrical circuit between electrodes (anode and cathode) and electric power supply. In Method I, the anode electrode was grounded, and the cathode electrode was coupled to the discharge power supply. In Method II, the anode electrode was connected with the discharge power supply, and the cathode electrode was grounded. There was not large difference in SiOx deposition rate between the plasma polymerizations by Methods I and II. Plasma polymers deposited from TMOS/O2 mixtures by Method II possessed smaller C/Si and O/Si atomic ratios than those deposited by Method I and showed advantage in gas barrier properties. The oxygen and water vapor permeation rates were 0.08–0.13 cm3 m?2 day?1 atm?1 at 30°C at 90% RH and 0.244–0.276 g m?2 day?1 at 40°C at 90% RH, respectively. From these results, it can be concluded that the ion‐assisted plasma polymerization is a useful technique for deposition of gas barrier SiOx thin films. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 915–925, 2007 |
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Keywords: | oxygen permeation water vapor permeation plasma polymerization XPS IR spectra SiOx |
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