The effect of ageing on bonding performance of plasma treated beech wood with urea-formaldehyde adhesive

Žigon, Jure; Saražin, Jaša; Šernek, Milan; Kovač, Janez; Dahle, Sebastian

doi:10.1007/s10570-021-03687-z

Cited by 8 publications

(4 citation statements)

References 82 publications

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“…This result was due to the major penetration of the thicker adhesive, confirming that the plasma treatment is effective on the wooden surface and can be suitable to optimize the drying time of the glue joint. A similar effect was found by applying a cold plasma treatment to white lauan wood glued with phenol-formaldehyde adhesives and to beech with urea-formaldehyde resins [34,35].…”

Section: Effect Of Plasma Treatmentsupporting

confidence: 68%

Optimization of Starch–Tannin Adhesives for Solid Wood Gluing

Magnabosco,

Kulyk,

Avancini

et al. 2024

Polymers

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Bio-based solutions for solid timber gluing have always been a very sensitive topic in wood technology. In this work, we optimize the gluing conditions of a starch–tannin formulation, which allows high performance in dry conditions and resistance to water dipping for 3 h, allowing for the D2 classification to be reached according to EN 204. It was observed that the starch–tannin formulations enhanced their performance by increasing the heating temperature, achieving satisfactory results at 140 °C for 13 min. The proportion of polyphenols in the mixture enhances the water resistance but is only tolerated until 20–30%. In particular, the addition of 10% tannin–hexamine enhances the water-resistant properties of starch for both quebracho and chestnut extract. The application of the jet of cold atmospheric plasma allows for good results with more viscous formulations, increasing their penetration in wood. Solid-state 13C-NMR analysis was also performed, and the spectroscopic information suggests establishing a coordination complex between starch and tannin.

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Section: Effect Of Plasma Treatmentsupporting

confidence: 68%

Optimization of Starch–Tannin Adhesives for Solid Wood Gluing

Magnabosco,

Kulyk,

Avancini

et al. 2024

Polymers

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“…This is firm evidence that the highly reactive species generated in GAD plasma led to efficient oxidation of the wood surface components. Note that the treatment with DBD or other low-temperature plasma in the literature also led to an increase of oxygen-containing groups, ,, but to a much lower extent compared to the GAD used in this study.…”

Section: Resultsmentioning

confidence: 66%

Cocuring of Epoxidized Soybean Oil-Based Wood Adhesives and the Enhanced Bonding Performance by Plasma Treatment of Wood Surfaces

Duan

Jiang

et al. 2022

ACS Sustainable Chem. Eng.

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Application of epoxidized soybean oil (ESO) in the wood industry as an adhesive has been limited due to the difficulty in fast curing ESO. Due to the advantages of the ureaformaldehyde (UF) resin, like low cost, high molecular weight, rich functional groups, as well as fast self-curing property, fast cocuring ESO-UF adhesives were prepared by mixing UF with ESO in different ratios (15−50%). Bonding performance tests indicated that the ESO-UF adhesives well balanced bonding strengths and the formaldehyde emission level; especially, the adhesives provided satisfactory water resistance. Structural characterization of cured ESO-UF adhesives showed that a copolymerization reaction occurred between epoxy groups of ESO and the hydroxyl groups of UF. Combined with gliding arc discharge (GAD) plasma treatment of the veneer surface, better bonding performances were achieved. X-ray photoelectron spectroscopy (XPS) analysis on the wood surfaces showed that the GAD treatment significantly increased the content of oxygencontaining groups like −OH and −COOH through oxidation and degradation of the chemical components on the wood surface. The generated reactive groups on the wood surface participated in the curing reaction of ESO-UF adhesives and led to improved bonding performances. Thus, the ESO-UF-activated wood surface (ESO-UF-AWS) system was developed in this study. The results of this study have demonstrated that the combination of seeking an efficient cocuring agent along with activating the wood surface is a valid strategy for realizing applications of ESO in the wood product industry.

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“…The minimum diffraction peak was at 2θ = 18°, deno scattering intensity of the diffraction peak in the non-crystalline region (Iam) [49fore and after plasma treatment of PM wood, the diffraction angle of I002 crystal pl 22.47°, indicating that plasma treatment had no significant effect on the positio diffraction peak in the crystalline region, and that the distance of crystal layers changed. The crystallinity before treatment was 45.82% and after treatment was indicating the increase in the crystallinity of cellulose was another reason for provement in the bonding strength after plasma treatment [9,[52][53][54].…”

Section: Crystallinity Analysis Of Pinus Massoniana Surface Woodmentioning

confidence: 93%

“…Before and after plasma treatment of PM wood, the diffraction angle of I 002 crystal plane was 22.47 • , indicating that plasma treatment had no significant effect on the position of the diffraction peak in the crystalline region, and that the distance of crystal layers was not changed. The crystallinity before treatment was 45.82% and after treatment was 51.21%, indicating the increase in the crystallinity of cellulose was another reason for the improvement in the bonding strength after plasma treatment [9,[52][53][54].…”

Section: Crystallinity Analysis Of Pinus Massoniana Surface Woodmentioning

confidence: 99%

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

Liang

et al. 2023

Forests

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Rosin has a great influence on the bonding of Pinus massoniana wood, and surface modification is an important way to solve this problem. In this study, Pinus massoniana wood was treated by plasma, and the effects of plasma treatment on the bonding performance and surface characteristics were investigated. The results showed the following: (1) After plasma treatment, the contact angle of Pinus massoniana wood was significantly reduced and the surface energy was significantly increased from 28.42 × 10−7 to 74.75 × 10−7 J·cm−2, and the surface wettability was also greatly improved. (2) Plasma high-energy particles experience simultaneous physical and chemical effects on the surface of Pinus massoniana wood. The former formed a micro-etched roughness on the wood surface and led to the increase in surface dispersion force, while the latter increased the aggregation and activity of polar groups on the wood surface and the degradation of some wood components and rosin, resulting in the increase in surface polar force and the enhancement of wettability. (3) After plasma treatment, the reactivity of wood was enhanced, and the cross-linking degree with adhesive and the heat release were increased. The bonding strength of Pinus massoniana wood could be improved: dry bonding from 5.08 to 5.38 MPa, boiling-water bonding strength from 4.12 to 4.53 MPa, cold-water bonding strength from 3.84 to 4.51 MPa, and the bonding stability and reliability of glued specimens were also improved.

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The effect of ageing on bonding performance of plasma treated beech wood with urea-formaldehyde adhesive

Cited by 8 publications

References 82 publications

Optimization of Starch–Tannin Adhesives for Solid Wood Gluing

Optimization of Starch–Tannin Adhesives for Solid Wood Gluing

Cocuring of Epoxidized Soybean Oil-Based Wood Adhesives and the Enhanced Bonding Performance by Plasma Treatment of Wood Surfaces

Effects of Plasma Treatment on the Surface Characteristics and Bonding Performance of Pinus massoniana Wood

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