Improved DMDHEU uptake of beech veneers after plasma treatment at atmospheric pressure

Wascher, Richard; Leike, Nils; Avramidis, Georg; Wolkenhauer, Arndt; Militz, Holger; Viöl, Wolfgang

doi:10.1007/s00107-015-0916-y

Cited by 12 publications

(6 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6. The increase of the polar components is in agreement with the literature, where the surfaces of beech wood (Král et al 2015;Wascher et al 2015;Wolkenhauer et al 2009), steel (Latifi et al 2014;Lee et al 2009; Lin and Chang 2011) and aluminum (Kim et al 2003;Mui et al 2017) were activated by plasma. The increment of total SFE, both relative in comparison to surfaces in untreated state and in absolute numbers, was the highest for steel (76.5%), followed by beech wood (15.4%) and aluminum (6.0%).…”

Section: Surface Free Energysupporting

confidence: 91%

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

et al. 2020

View full text Add to dashboard Cite

Combinations of wood and metal are interesting hybrid composite materials, joining together the low density of wood with the stiffness and strength of metals. Different types of adhesives are used to connect wood and metal elements, but the compatibility between adhesives used and load-bearing materials must be sufficient, which often is challenging. In adhesive bonding technology, surface treatments are a crucial step in the process. In this study, an atmospheric plasma discharge was employed to enhance the adhesion strength of joints between common beech (Fagus sylvatica L.) wood, metals (steel and aluminum alloy), and four different types of adhesives. The optical properties of plasma discharges and its influence on treated substrates' surface morphology depended on the inherent properties of the treated materials. X-ray photoelectron spectroscopy revealed the surface oxidation of all the materials after plasma treatment. Consequently, the surface free energy of all materials increased as well. The positive effect of the plasma treatment on the tensile shear strength of single-lap joints shows a high potential of atmospheric plasma treatment technology for enhancement of adhesives strength of joints combining wooden elements, wood and steel, or wood and aluminum alloys. In addition to that, expensive epoxy and polyurethane adhesives could be replaced by more affordable polyvinyl acetate and melamine-ureaformaldehyde adhesives, and still perform at equal levels if the plasma was applied prior to bonding.

show abstract

Section: Surface Free Energysupporting

confidence: 91%

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…For example, treatments using dimethylol dihydroxyethylene urea (DMDHEU) [i.e. [10,23,24]], melamine resin [10,25], silane, siloxane or silicon polymers [26e28] were found to improve the mechanical strength of wood.…”

Section: Introductionmentioning

confidence: 99%

Determination of the effectiveness of a combined thermal/chemical wood modification by the use of FT–IR spectroscopy and chemometric methods

Popescu

Jones

Kržišnik

et al. 2020

Journal of Molecular Structure

View full text Add to dashboard Cite

“…Studies demonstrate that the use of technical plasmas as a pretreatment step in combination with simple immersion processes for wood veneers leads to a high permeation of the wood structure with modifier [6]. In this context, wood veneers were exposed to a gas discharge, using oxygen-containing gases (air), which resulted in higher permeation of the substrate and, more generally, improved uptake of modifiers and coating agents [7][8][9][10][11]. One explanation may be found in the hypothesis postulated by Wascher et al that under specific conditions micro-discharges can occur in the cavities of thin wood veneers.…”

Section: Introductionmentioning

confidence: 99%

Plywood Made from Plasma-Treated Veneers: Investigation of Performance Differences between Plasma-Pretreated and Untreated Beech Veneers at Comparable Melamine Resin Load

Wascher¹,

Avramidis²,

Viöl

2021

Forests

Self Cite

View full text Add to dashboard Cite

In this study, the dimensional stability and mechanical properties of plywood made from untreated and plasma-pretreated beech veneers were compared. The wood veneers used (native and thermally modified) were impregnated with melamine resin in a simple dipping process prior to plywood production. The duration of the impregnation process was adjusted to give the same melamine resin loading for the different veneer types, with the plasma-pretreated veneers requiring only a fraction of the impregnation time compared with non-plasma-pretreated veneers. With comparable melamine loading, testing of the mechanical properties of the plywood for the different specimen collectives showed significant differences in some cases with respect to compressive strength, bending strength and tensile strength (with the associated moduli of elasticity). For example, it was shown that plywood made from plasma-pretreated native beech veneers shows an increase in bending strength of about 8%, and from plasma-pretreated and thermally modified beech veneers, there is an increase of about 10% compared to the reference.

show abstract

Improved DMDHEU uptake of beech veneers after plasma treatment at atmospheric pressure

Cited by 12 publications

References 18 publications

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

Enhancement of strength of adhesive bond between wood and metal using atmospheric plasma treatment

Determination of the effectiveness of a combined thermal/chemical wood modification by the use of FT–IR spectroscopy and chemometric methods

Plywood Made from Plasma-Treated Veneers: Investigation of Performance Differences between Plasma-Pretreated and Untreated Beech Veneers at Comparable Melamine Resin Load

Contact Info

Product

Resources

About