Wood surface modification in dielectric barrier discharges at atmospheric pressure

Rehn, P.; Wolkenhauer, Arndt; Bente, M.; Förster, Siegfried; Viöl, Wolfgang

doi:10.1016/s0257-8972(03)00372-4

Cited by 92 publications

(50 citation statements)

References 5 publications

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“…Plasma treatments can improve the wettability of wood surfaces and the adhesion of lacquer to wood [81,111]. They can also increase the surface permeability of wood and the penetration of coatings into wood [112,113].…”

Section: Modifying the Wood-coating Interfacementioning

confidence: 99%

The Search for Durable Exterior Clear Coatings for Wood

et al. 2015

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Abstract:The goal of a durable exterior clear coating has eluded generations of coatings technologists, despite long-standing desire amongst the public for such a coating. The journey towards this goal initially focused on modifications to coating formulation, but took a completely different direction when it was found that a UV-transparent silicone clear coating on wood modified with chromic acid met consumer expectations of coating durability. This finding sparked world-wide interest in wood pre-treatments as a way of enhancing the durability of clear coatings. This interest initially focused on transition metal compounds, but has now shifted in the direction of organic and inorganic photostabilizers or even more drastic pre-treatments. Pre-treatments that dimensionally stabilize wood, protect it from microbial degradation and photostabilize lignin, when combined with flexible, photostable, coatings provide the next way-stop on the journey towards achieving the goal of durable exterior clear coatings for wood. This paper reviews this journey, drawing upon our research and that of other groups who have focused on this elusive goal. OPEN ACCESSCoatings 2015, 5 831

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Section: Modifying the Wood-coating Interfacementioning

confidence: 99%

The Search for Durable Exterior Clear Coatings for Wood

et al. 2015

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“…Plasma-based modification of wood surface using air as the process gas is known to improve wetting characteristics [13][14][15], which enhances the adhesion of coatings and adhesives [16][17][18][19]. Additionally, the uptake characteristics of wooden materials for water and waterbased modification agents are positively affected by plasma modification [20][21][22][23] as well as the penetration depth of adhesives applied to pre-treated wood surfaces [24].…”

Section: Introductionmentioning

confidence: 99%

Plywood made from plasma-treated veneers: melamine uptake, dimensional stability, and mechanical properties

et al. 2017

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This study investigates the dimensional stability and mechanical properties of plywood boards made of thermally modified and unmodified beech veneers that have undergone plasma pre-treatment before melamine resin impregnation. The water and melamine resin uptake and resulting weight percent gain of the veneers were investigated, whereby the air plasma pre-treated veneers showed improved liquid uptake. Five-layer plywood boards were then manufactured and tested for their dimensional stability, compressive strength, bending strength, and tensile strength. Plywood boards made of thermally modified and plasma pre-treated veneers showed a significantly improved dimensional stability, along with small influences on their mechanical properties.

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“…In terms of the final properties of the treated wood species, the plasma gas is likely one of the most important parameters to be considered, as it determines the nature of the active species (radicals, metastables, ions, and photons) interacting with the wood substrates. Inorganic plasma gases such as nitrogen, oxygen, carbon dioxide, air, argon, and others are generally used to alter surface properties such as wettability (Blanchard et al 2009;Denes et al 2005;Evans et al 2007;Podgorski et al 2002;Rehn et al 2003), surface energy, and coating adhesion (Blanchard et al 2009;Evans et al 2007;Rehn et al 2003). Plasmas generated from inorganic gases can alter the near-surface composition of the wood surface by ion or atom interactions, cause etching of low-molecular weight species, and can modify their chemical structure following ultraviolet irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of a specific plasma treatment is often characterized using contact angle analysis (Asandulesa et al 2010;Blanchard et al 2009;Busnel et al 2010;Evans et al 2007;Podgorski et al 2000;2001b;Rehn et al 2003;Zanini et al 2008) and adhesion tests (Blanchard et al 2009;Busnel et al 2010;Evans et al 2007;Kim et al 2009;Nussbaum 1999;Rehn et al 2003). Regarding the effect of atmospheric air plasma treatment, Avramidis et al (2012) found that there was little change in surface energy of pine wood, but that extractives were oxidized at the surface, according to XPS measurements.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Wood Surface Modification by Atmospheric-Pressure Plasma on Waterborne Coating Adhesion

Riedl¹,

Angel²,

Prégent³

et al. 2014

BioResources

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In this study, the effect of an atmospheric-pressure plasma treatment on the surface properties of sugar maple (Acer saccharum March.) and black spruce (Picea mariana (Mill.) was analyzed by contact angle measurement and a water-based coating pull-off testing. The plasma gases used were Ar, N2, CO2, and air. It was found that the wettability with water and the coating adhesion of maple and spruce can be highly influenced by the nature of the plasma gas used and the plasma treatment time. For example, in the case of sugar maple, coating adhesion increased by 66% after 1.5 s of exposure to argon plasma. Repetition of the contact angle measurement one and two weeks after the initial plasma treatment showed that the plasma-induced modification is not permanent. Improvements in wettability and adhesion were also obtained with simpler, cheaper air plasmas, a result promising for the development of advanced plasma reactors operating at atmospheric pressure, specially designed for the wood industry.

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Wood surface modification in dielectric barrier discharges at atmospheric pressure

Cited by 92 publications

References 5 publications

The Search for Durable Exterior Clear Coatings for Wood

The Search for Durable Exterior Clear Coatings for Wood

Plywood made from plasma-treated veneers: melamine uptake, dimensional stability, and mechanical properties

Effect of Wood Surface Modification by Atmospheric-Pressure Plasma on Waterborne Coating Adhesion

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