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Mechanisms of Oxygen and Water Diffusion Through Multilayer Inorganic/Organic Coatings

Published online by Cambridge University Press:  10 February 2011

Yelena G. Tropsha ,
Noel G. Harvey  and
Jane C. Graper
Yelena G. Tropsha
Affiliation:
Polymer Science and Technology Department, Becton Dickinson Research Center, 21 Davis Drive, Research Triangle Park, NC 27709–2016
Noel G. Harvey
Affiliation:
Polymer Science and Technology Department, Becton Dickinson Research Center, 21 Davis Drive, Research Triangle Park, NC 27709–2016
Jane C. Graper
Affiliation:
Polymer Science and Technology Department, Becton Dickinson Research Center, 21 Davis Drive, Research Triangle Park, NC 27709–2016
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Abstract

Polyethyleneterephthalate substrates were coated with thin films of silicone oxide deposited by magnetically enhanced chemical vapor deposition. The rates of oxygen and water vapor transport through the coated and uncoated film systems were obtained as a function of temperature. Activated rate theory treatment of oxygen transmission rates revealed that silicone oxide coatings were imperfect; the apparent free energies of activation (ΔEp) for transport through film substrates which were coated on a single side were statistically identical to uncoated controls. However, multilayer coatings, consisting of two silicone oxide layers separated by an organic layer resulted in a dramatic increase in the ΔEp value. Similar effects were observed in polymer films coated on both sides with identical oxide layers. A simple empirical model for the change in transport mechanism is offered to explain this unanticipated results.

Activated rate theory treatment of water vapor transmission rates for these same film systems showed no obvious change in transport mechanism. However, ΔEp values obtained for water vapor permeation through silicone oxide coated polyethyleneterephthalate, polystyrene, polypropylene, and polycarbonate substrates were identical within experimental error, suggesting attractive interaction between the oxide layer(s) and water.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 403
Copyright
Copyright © Materials Research Society 1997

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References

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