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Mechanical Characterization of Thin Metal Oxide Coatings on Polymer Films by Fragmentation Analysis
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Tetra Pak SA, DSO, Lund, Sweden.
Adhemon Thin Technology, Lausanne, Switzerland.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
2017 (English)In: Svenska mekanikdagar 2017: Uppsala 12–13 juni, 2017, p. 74-74Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Coating technology is an area of intense research for food packaging applications. This is because the coating needs to have a high barrier property to preserve the flavours and nutrients of the food inside the package, i.e. protect the food against environmental interaction (oxygen, moisture, light, contamination from microorganism). In this particular investigation, roll-to-roll vacuum deposition, in which the coating is deposited on polymer films, is studied. This combines the barrier properties from the coating and the flexibility from the polymer. However, this coating material can be brittle and sensitive to cracking in a such way that the permeability can increase due to damage [1]. Mechanic characterization is fundamental for this coating/polymer system to understand and develop methods to keep the integrity of the coating properties.

This presentation will demonstrate how to characterize novel TiO2 (titanium oxide) and MOX (mixed oxide, TiO2 and Al2O3) on polymer film by fragmentation test [2] performed using a table-top scanning electron microscope (SEM) and an in-situ tensile stage for tracking the multiple cracking throughout the samples during increasing tension. This experiment allows to identify the nominal strain when the first flaw appear (crack onset strain), and also the point when no more cracks appear (crack saturation strain). Figure 1 shows the result of the TiO2 coating of 6 nm thick on top of PET film stretched at 30% tensile strain. In addition, based on this fragmentation analysis a micromechanical model was implemented to calculate cohesive interfacial shear strength between coating and polymer as well as a comparison these results with FE simulation for these samples.

Place, publisher, year, edition, pages
2017. p. 74-74
National Category
Nano Technology Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-332121OAI: oai:DiVA.org:uu-332121DiVA, id: diva2:1152328
Conference
Svenska mekanikdagar 2017,Uppsala 12–13 june, Sweden
Note

References

 

[1] Yanaka, M, Henry, BM, Roberts, AP et al., (2001). How cracks in SiOx-coated polyester films affect gas permeation. THIN SOLID FILMS, 397 (1-2), 176-185P.

[2] Fayet, C. Neagu, K. Gamstedt. Mechanics-driven material design for optimized barrier films, Web Coating and Handling Conference, AIMCAL 2015.

Available from: 2017-10-24 Created: 2017-10-24 Last updated: 2017-10-26Bibliographically approved

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