Oxygen diffusion barrier properties of transparent oxide coatings on polymeric substrates

Chatham, H.

doi:10.1016/0257-8972(95)02420-4

Cited by 332 publications

(138 citation statements)

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“…These include the protection of polymers against photo-degradation [27] and of microdevices and flat panel displays from oxygen and moisture ingression [28,29], the prevention of conversion efficiencies decrease of solar cells [30], as well as patrimony conservation purposes [31]. As will be detailed in Section 2 of this report, SiO x coatings of thickness of the order of 10 to 100 nm decrease the oxygen permeability of polymer films by typically two orders of magnitude [24]. In the past two decades, most of the research has been devoted to the physical and chemical analyses of the barrier system, which includes the characterization of the apparent permeability of the coated polymer with respect to the deposition process, and resulting coating and interface defect structure.…”

Section: Introductionmentioning

confidence: 99%

“…The present review focuses on transparent silicon oxide (SiO x ) thin coatings on thermoplastic substrates, which have emerged in the 1980's as an alternative to metallized plastics, to protect pharmaceuticals [16,17] and food products [18][19][20][21][22][23] from oxygen (e.g. review [24]). These systems proved also to be efficient barriers towards ingression of other small penetrants such as moisture, as also aroma losses.…”

Section: Introductionmentioning

confidence: 99%

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Durability of nanosized oxygen-barrier coatings on polymers

Leterrier

2003

Progress in Materials Science

467

341

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Research on silicon oxide thin films developed as gas-barrier protection for polymer-based components is reviewed, with attention paid to the relations between (i) coating defects, cohesive strength and internal stress state, and (ii) interfacial interactions and related adhesion to the substrate. The deposition process of the oxide from a vapor or a plasma phase leads in both cases to the formation of covalent bonds between the two materials, with high adhesion levels. The oxide coating contains nanoscopic defects and microscopic flaws, and their respective effect on the barrier performance and mechanical resistance of the coating is analyzed. Potential improvements are discussed, including the control of internal stresses in the coating during deposition. Controlled levels of compressive internal stresses in the coating are beneficial to both the barrier performance and the mechanical reliability of the coated polymer. An optimal coating thickness, with low oxygen permeation and high cohesive strength, is determined from experimental and theoretical analyses of the failure mechanisms of the coating under mechanical load. These investigations are found relevant to tailor the interactions and stress state in the interfacial region, in order to improve the reliability of the coating/substrate assembly. #

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durability of nanosized oxygen-barrier coatings on polymers

Leterrier

2003

Progress in Materials Science

467

341

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“…Silicon oxide coatings have proven to be useful in improving the gas barrier properties of plastic packaging, often reducing the permeation of oxygen and water through polymer film by 100 times or more [1]. Such composites have several advantages over traditional metallised polymer films, such as transparency and microwave compatibility.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of SiOx gas barrier coatings on polyester films

Howells¹,

Henry²,

Leterrier³

et al. 2008

Surface and Coatings Technology

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This paper reports the impressive mechanical properties of 1 μm thick carbon-containing SiO x gas barrier coatings, characterised using the uniaxial fragmentation test. Such coatings have been found to act as excellent barriers to water vapour permeation partly because they can be made so thick without stress induced cracking. The impressive mechanical properties are thought to be due in part to the high amount of carbon they contain, which gives them a more organic character, as well as the fact that they are deposited as a succession of thinner layers. The adhesion of the coatings to the polyester film is good in all cases, reflecting a high density of covalent bonding at the interface. Improvement of the mechanical properties of a SiO x /PET composite can be achieved by altering the substrate. By replacing the PET with a heat-stabilised (HS) PET film, a HS film with an acrylate layer or PEN, it is found that the coating displays improved mechanical properties and adhesive strength (as well as barrier). This is thought to be due to the superior surface thermal and mechanical properties of these substrates. Deposition temperatures are at least 80°C, which causes molecular motion at the surface of a plain PET film and creates defects in the SiO x coating as it grows, making it more brittle and permeable to gas flow.

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“…Does "thickness" include aluminum oxide or only pure aluminum? Accordingly, when having a look at various publications [37,39,42,[56][57][58][59][60], the thickness is measured by numerous different methods. Because the thickness of these aluminum coatings is much shorter than the wavelength of visible light, traditional microscopy is not usable for this application.…”

Section: Importance Of Coating Thickness For Barrier Propertiesmentioning

confidence: 99%

Thickness Measurement Methods for Physical Vapor Deposited Aluminum Coatings in Packaging Applications: A Review

Lindner

Schmid

2017

Coatings

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Abstract:The production of barrier packaging materials, e.g., for food, by physical vapor deposition (PVD) of inorganic coatings such as aluminum on polymer substrates is an established and well understood functionalization technique today. In order to achieve a sufficient barrier against gases, a coating thickness of approximately 40 nm aluminum is necessary. This review provides a holistic overview of relevant methods commonly used in the packaging industry as well as in packaging research for determining the aluminum coating thickness. The theoretical background, explanation of methods, analysis and effects on measured values, limitations, and resolutions are provided. In industrial applications, quartz micro balances (QCM) and optical density (OD) are commonly used for monitoring thickness homogeneity. Additionally, AFM (atomic force microscopy), electrical conductivity, eddy current measurement, interference, and mass spectrometry (ICP-MS) are presented as more packaging research related methods. This work aims to be used as a guiding handbook regarding the thickness measurement of aluminum coatings for packaging technologists working in the field of metallization.

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Oxygen diffusion barrier properties of transparent oxide coatings on polymeric substrates

Cited by 332 publications

References 11 publications

Durability of nanosized oxygen-barrier coatings on polymers

Durability of nanosized oxygen-barrier coatings on polymers

Mechanical properties of SiOx gas barrier coatings on polyester films

Thickness Measurement Methods for Physical Vapor Deposited Aluminum Coatings in Packaging Applications: A Review

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