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Investigation of the ion permeability of poly(p-xylylene) films

Hanefeld, Phillip and Sittner, Frank and Ensinger, Wolfgang and Greiner, Andreas :
Investigation of the ion permeability of poly(p-xylylene) films.
In: e-Polymers, 026 pp. 1-6. ISSN 1618-7229
[Article] , (2006)

Abstract

Abstract: The ion permeability of poly(p-xylylene) (PPX, parylene-N®) thin films was investigated using a cyclovoltammetric setup. Iron rods of different surface roughness were coated with PPX films of different thickness (140 � 700 nm) by vapour phase deposition (Gorham process). The presence of pinholes in PPX films deposited as described was analyzed by ion permeability according to cyclovoltammetric measurements. Current densities were directly related to the area of iron not covered by the polymer. It was found that films deposited on iron surfaces by the Gorham process showed significant ion permeability for film thicknesses below 500 nm and no permeability at all for films equal to or thicker than 700 nm, which indicated the absence of pinholes of PPX films of 700 nm thickness. Furthermore, films of 140 nm were deposited on iron surfaces of different roughness (the mean roughness was measured to be 102 nm, 103 nm and 105 nm). Current density increased by the increase in roughness, which confirmed that pinhole formation correlated with surface roughness.

Item Type: Article
Erschienen: 2006
Creators: Hanefeld, Phillip and Sittner, Frank and Ensinger, Wolfgang and Greiner, Andreas
Title: Investigation of the ion permeability of poly(p-xylylene) films
Language: English
Abstract:

Abstract: The ion permeability of poly(p-xylylene) (PPX, parylene-N®) thin films was investigated using a cyclovoltammetric setup. Iron rods of different surface roughness were coated with PPX films of different thickness (140 � 700 nm) by vapour phase deposition (Gorham process). The presence of pinholes in PPX films deposited as described was analyzed by ion permeability according to cyclovoltammetric measurements. Current densities were directly related to the area of iron not covered by the polymer. It was found that films deposited on iron surfaces by the Gorham process showed significant ion permeability for film thicknesses below 500 nm and no permeability at all for films equal to or thicker than 700 nm, which indicated the absence of pinholes of PPX films of 700 nm thickness. Furthermore, films of 140 nm were deposited on iron surfaces of different roughness (the mean roughness was measured to be 102 nm, 103 nm and 105 nm). Current density increased by the increase in roughness, which confirmed that pinhole formation correlated with surface roughness.

Journal or Publication Title: e-Polymers
Volume: 026
Publisher: e-Polymers
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Nov 2012 08:34
Funders: We would like to thank Specialty Coating Systems, Indianapolis, U.S.A., for the kind support and donation of parylene monomer.
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