Abstract
There has been a growing interest over the last few years in the development of industrial transparent barrier coatings. The vacuum-deposited materials are based on silicon (SiO χ ) and aluminium (Al y O z ) oxide compounds. Significant improvements are observed in the barrier properties of coated plastic films. In this paper we review the deposition techniques and focus on the influence of surface preparation before deposition. Plasma activation of the polymer surfaces increases the adhesion of the coating to the substrate. New results obtained by atomic force microscopy and transmission electron microscopy complement our published X-ray photoelectron spectroscopy data and confirm the importance of the formation of chemical bonds at the coating-polymer interface.
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