Surface properties and the stability of poly(ethylene terephtalate) films treated in plasmas of helium‐oxygen mixtures

Plăcintă, Gheorghe; Arefi‐Khonsari, Farzaneh; Gheorghiu, Mariana; Amouroux, J.; Popa, G.

doi:10.1002/(sici)1097-4628(19971114)66:7<1367::aid-app15>3.3.co;2-a

Cited by 10 publications

(11 citation statements)

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“…The active species -such as He metastable, ions, electrons or UV radiation -in a He glow discharge strike the wood surface, causing crosslinking of the molecules. In addition, they decrease the contact angle and increase the surface free energy (Placinta et al 1997), which was proved in this study for both lapacho and rode locus wood floor tiles. Removal of hydrophobic extractives from the plasma-treated wood surface contributes to increase the surface energy, and consequently to reduce the water contact angle (Avramidis et al 2012).…”

Section: Resultssupporting

confidence: 73%

Surface wettability of Brazilian tropical wood flooring treated with He plasma

Cademartori

Nisgoski

Magalhães

et al. 2016

Maderas, Cienc. tecnol.

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This study investigated the effect of plasma treatment on changes of surface wettability of wood flooring from two Brazilian tropical species, Hymenaea spp. (rode locus) and Tabebuia spp. (lapacho). Wood flooring samples were plasma treated at low pressure in a helium atmosphere. Energy level was set at 100 W and four glow discharge times (5, 15, 30 and 45 s) were tested. Changes in wettability were investigated by measuring apparent contact angle, droplet volume and spreading contact area. The results showed less susceptibility of lapacho wood to the plasma treatments, while reduction of apparent contact angle in rode locus wood reached up to 76% for longer discharge times. In general, discharge time of 15 s produced the same effect as discharge of 45 s on wettability, which is important for industrial applications. Visual analyses revealed increase of water droplet spreading on lapacho wood surface, even though the variation of spreading contact area was not significant. Plasma treatment is feasible to improve wettability of tropical woods. Nevertheless, these findings should be investigated further due to the intrinsic characteristics of woods from tropical species.

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Section: Resultssupporting

confidence: 73%

Surface wettability of Brazilian tropical wood flooring treated with He plasma

Cademartori

Nisgoski

Magalhães

et al. 2016

Maderas, Cienc. tecnol.

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“…refs. [60,[104][105][106][107][108][109]) and PP [110]. According to Unger and co-workers [111], the phenyl rings in partially crystalline PET provide effective protection against plasma attack, compared for instance to polystyrene, for which the phenyl rings are on side chains.…”

Section: Surface Modification Of the Polymer Substratementioning

confidence: 99%

Durability of nanosized oxygen-barrier coatings on polymers

Leterrier

2003

Progress in Materials Science

466

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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“…The modification can be altered over a wide range of properties from hydrophobic to hydrophilic, depending on the plasma power and gas feed 28. The use of gaseous mixtures facilitates crosslinking 29. For instance, the addition of argon produces better hydrophilicity and wettability, as compared to pure oxygen plasma 20.…”

Section: Introductionmentioning

confidence: 99%

Plasma Deposition of Permanent Superhydrophilic a‐C:H:N Films on Textiles

Hossain

Hegemann

Fortunato

et al. 2007

Plasma Processes & Polymers

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A new approach to permanent hydrophilic modification of material surfaces is demonstrated using the deposition of nanoscaled functional coatings in RF plasmas at low temperatures under rivaling deposition/etching conditions. The incorporation of nitrogen and the generation of free radicals in a‐C:H films yields a strong hydrophilic modification when the deposited surface is exposed to atmosphere. Dyeing of nanoporous a‐C:H:N films demonstrated a high coating quality and the incorporation of accessible amine functionalities within the coating. This combination of polar groups with a suitable texturing ensures long‐term mechanical stability of the coating.

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Surface properties and the stability of poly(ethylene terephtalate) films treated in plasmas of helium‐oxygen mixtures

Cited by 10 publications

References 0 publications

Surface wettability of Brazilian tropical wood flooring treated with He plasma

Surface wettability of Brazilian tropical wood flooring treated with He plasma

Durability of nanosized oxygen-barrier coatings on polymers

Plasma Deposition of Permanent Superhydrophilic a‐C:H:N Films on Textiles

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