Influence of substrate additives on the mechanical properties of ultrathin oxide coatings on poly(ethylene terephthalate)

Rochat, G.; Leterrier, Y.; Fayet, Pierre; Månson, J.-Å. E.

doi:10.1016/j.surfcoat.2005.03.027

Cited by 24 publications

(11 citation statements)

References 25 publications

(24 reference statements)

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“…Six different polymer substrates were selected [14,15] and microwavable food packaging (SiO x /PET) [16]. The thermo-mechanical properties of individual materials are given in Table 1, and all investigated multilayer films are listed in Table 2.…”

Section: Dielectric Coatings On Polymer Substratesmentioning

confidence: 99%

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Pinyol¹,

Meylan²,

Gilliéron³

et al. 2009

Thin Solid Films

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An electro-fragmentation method was developed as a fast alternative to the time consuming fragmentation test carried out in situ in a microscope, to investigate the failure of dielectric inorganic coatings on polymer substrates. An ultrathin conductive layer was used to probe the onset of tensile failure in the dielectric coating through changes of its electrical resistance. A careful selection of the conductive layer has been carried out to avoid artifacts resulting for instance from a change of the cohesive properties (e.g. internal stress state) of the investigated structures. Au layers were found to be too ductile, contrary to Al-Ti layers that were too brittle, which invalidated the use of both materials to probe the failure of the dielectric coatings. In contrast, for structures on high-temperature polymer substrates, a 10 nm thick amorphous graphite (a-G) layer was found to accurately reproduce the cracking of the coating. The Young's modulus and coefficient of thermal expansion of the a-G layer are low enough not to impact the internal strain, hence the crack onset strain of the dielectric coating. The a-G layer is also sufficiently brittle, and its cohesive failure and resulting increase of electrical resistance is triggered by the failure of the dielectric coating. The a-G electro-fragmentation method is presently limited to polymers substrates with a glass-transition temperature higher than 100°C.

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Section: Dielectric Coatings On Polymer Substratesmentioning

confidence: 99%

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Pinyol¹,

Meylan²,

Gilliéron³

et al. 2009

Thin Solid Films

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“…(2) has been applied to identify coating toughness from COS data in the case of compliant substrate and reasonable G c estimates obtained. However, only for ultrathin, 10 nm SiO x coating considered in [35] the defect size distribution has been determined [23,28]. It has been ascertained that defects of size exceeding the steady-state limit k ss , Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Reactive ion etching appears promising as a possible means for accomplishing it in the case of polymer substrates [20,23,27,28]. Alternatively, the coating has to be pre-cracked (see e.g.…”

Section: Resultsmentioning

confidence: 99%

“…The macrodefect population was analyzed using a plasma etching decoration method, in which the coated polymer is exposed to atomic oxygen, and is etched at the location of coating defects [27,28]. This method amplifies the size of defects, which become detectable using optical microscopy, and is a powerful tool to discriminate defects from artifacts such as dust particles.…”

Section: à4mentioning

confidence: 99%

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Evaluation of toughness by finite fracture mechanics from crack onset strain of brittle coatings on polymers

Andersons

Modniks

Leterrier

et al. 2008

Theoretical and Applied Fracture Mechanics

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Crack onset strain measurements of a confined layer in tension provide the means for layer toughness estimation. The procedure can be simplified if steady-state conditions prevail starting from the commencement of crack propagation, an assumption frequently employed in energy release rate evaluation. It is demonstrated, by numerical analysis of experimental data, that an estimate of the defect size in the film is needed in order to reliably evaluate its fracture toughness from the crack onset strain. Only if microcracks of sufficient size are present in the brittle layer, the steady-state energy release rate at the crack onset strain can be identified with layer toughness. Otherwise, the toughness estimate obtained by such a procedure is likely to be non-conservative.

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“…The residual gas permeation results from the presence of defects such as deposition instabilities and micro-cracks [3]. These defects, in turn, are crack initiation sites which control the toughness of the barrier coatings and eventually limit their introduction into complex, high rate conversion processes including roll-to-roll methods, folding and welding [4,5]. Considerable effort is ongoing to develop super high barrier coatings to protect emerging flexible electronic devices from environmental degradation.…”

Section: Introductionmentioning

confidence: 99%

Supertough UV-curable silane/silica gas barrier coatings on polymers

Leterrier¹,

Singh²,

Bouchet³

et al. 2009

Surface and Coatings Technology

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Ultra-thin (10-500 nm) photo-polymerized γ-methacryloxypropyltriethoxysilane (MPMS) and vinyltrimethoxysilane (VTS) layers applied to SiO 2 coatings on polyethylene terephthalate films improved the oxygen barrier performance of the oxide coated films by more than two-fold, and the coating strain to failure from 1.5% to beyond 5%, depending on the processing conditions. The oxygen transmission rate of composite films was measured under tensile strain. The chemical conversion of both MPMS and VTS with two different photoinitiators was studied by means of photo-calorimetry experiments, with attention paid to the influence of temperature, UV-light intensity and photoinitiator concentration. The conversion data were analyzed using an n th -order kinetic model, including an Arrhenius dependence of the temperature and a power-law dependence of the light intensity on the reaction rate. The improvement in mechanical integrity of the silane/silica barrier coating, with a toughness as high as 80 J/m 2 was found to be controlled by the conversion state of the silane.

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Influence of substrate additives on the mechanical properties of ultrathin oxide coatings on poly(ethylene terephthalate)

Cited by 24 publications

References 25 publications

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Electro-fragmentation analysis of dielectric thin films on flexible polymer substrates

Evaluation of toughness by finite fracture mechanics from crack onset strain of brittle coatings on polymers

Supertough UV-curable silane/silica gas barrier coatings on polymers

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