Study of adhesive bondlines in modified wood with fluorescence microscopy and X-ray micro-computed tomography

Bastani, Alireza; Αδαμόπουλος, Στέργιος; Koddenberg, Tim; Militz, Holger

doi:10.1016/j.ijadhadh.2016.04.006

Cited by 38 publications

(31 citation statements)

References 22 publications

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“…Although PUR glue has been reported to have a higher penetration, PVAc glue seems to be more successful under the in terms of the flexibility structure of the glue. As Zheng et al (2004) and Bastani et al (2016) have reported; difficulties arise in establishing direct relationships between adhesive penetration and bond performance.…”

Section: Resultsmentioning

confidence: 99%

“…In experimental efforts to improve the wood-adhesive interaction and provide a smooth surface with minimal extractives and machining debris, wood is often resurfaced prior to bonding. Nevertheless, penetration of adhesive into wood does not always correlate with bond strength confirmed also for modified wood that lumen (Chandler et al 2005;Bastani et al 2016). By applying existing and newly developed techniques to the study of specific adhesives, a much better knowledge of the factors that lead to durable bonds can be obtained.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Effect of Surface Roughness on the Bonding Strength of Wooden Materials

Söğütlü¹

2017

BioResources

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The purpose of this study was to determine the effect of surface roughness on bonding strength in Oriental beech, cherry, Scots pine, and Taurus cedar woods. In conformance with this objective, after planing the wooden materials under different conditions, their surface roughness values were determined in accordance with various standards using scanning equipment. The bonding strength test specimens were prepared using polyvinyl acetate (PVAc) and polyurethane (PUR) adhesives after the wooden materials were separated into three groups of varying surface roughness values, after which bonding strength experiments were carried out. The data obtained from the experiments were evaluated statistically at a 95% level of confidence. According to the test results, the highest bonding strength was obtained in the Oriental beech (9.27 N/mm 2 ), whereas the lowest bonding strength was obtained in the Scots pine (3.65 N/mm 2 ). There was not a statistically significant difference between the bonding strength of the cherry and Oriental beech woods. The PVAc adhesive (7.61 N/mm 2 ) produced more successful results than the PUR adhesive (5.63 N/mm 2 ). Furthermore, it was found that in the specimens with low surface roughness values for each wood type and used adhesives had high bonding strengths.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of the Effect of Surface Roughness on the Bonding Strength of Wooden Materials

Söğütlü¹

2017

BioResources

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“…The pH of M4 was 3.83 and was lower than M1 (5.27). Oak wood has pH below 4, which makes this adhesive-wood bond more chemically compatible (Zenkteler 1996;Cagle 1973;Bastani et al 2016).…”

Section: Processing Partmentioning

confidence: 99%

Impact of melamine and its derivatives on the properties of poly(vinyl acetate)-based composite wood adhesive

et al. 2020

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A fire retardant composite adhesive for bonding wood and wood-based elements has been developed and characterized. To obtain the enhanced fire-proof properties of the wood adhesive dispersion based on the poly(vinyl acetate) (PVAc), ceramic fillers (17.5 wt% total)—alumina, silica, kaolin and glass fibers were applied. Moreover, fire retardants such as melamine, melamine phosphate and melamine polyphosphate (up to 7 wt%) were also used. Thermal analysis (TG-DSC), strength tests, rheology, pH and flammability measurements (PCFC) were performed. The best properties of the adhesive were achieved for ceramic additives supported by melamine phosphate. A slight improvement of shear strength, shift of the last decomposition step of PVAc (residue degradation) towards higher temperatures by about 50 °C, reduction in mass loss from 100 wt% to less than 70 wt% and about 30–40% improvement of flammability parameters such as heat release capacity, total heat release or peak heat release rate were found compared to the pure poly(vinyl acetate) adhesive.

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“…The lowest bonding strength was obtained in the layered laminated composite material supported with an aluminum wire mesh and glued with PVAc (3.748 N/mm 2 ). Polyurethane adhesive has been reported to have a higher penetration (Bastani et al 2016). This could be due to the fact that the polyurethane adhesive provided a better adaptation with the support materials used between the layers and the wooden materials and that it established a stronger chemical bond.…”

Section: Bonding Strengthmentioning

confidence: 99%

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

et al. 2017

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Laminated composite wooden construction elements were produced with 7 layers of Scots pine (Pinus sylvestris L.). Fiberglass wire mesh and aluminum wire mesh, which were used as reinforcement materials, were pressed with polyvinyl acetate (PVAc) and polyurethane-type adhesives between each Scots pine layer. The highest bonding strength values were obtained from laminated control specimens produced with polyurethane adhesive without using support materials (4.98 N/mm 2 ) and laminated control specimens made with polyurethane adhesive without using support materials (4.39 N/mm 2 ), respectively. The modulus of elasticity in bending perpendicular to the glue line values of all the specimens except the laminated control specimens produced with polyurethane adhesive without using support materials (14800 N/mm 2 ) were lower than solid wood (6720 N/mm 2 ). In contrast, in the experiments for the modulus of elasticity parallel to the glue line, the variables (adhesive, intermediary layer materials) used for all experiments and specimens were effective factors. Although the modulus of elasticity in bending parallel to the glue line values of all samples were higher than solid wood (6720 N/mm 2 ), the maximum value was obtained in the laminated control specimens produced with polyurethane adhesive without using support materials (17800 N/mm 2 ).

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Study of adhesive bondlines in modified wood with fluorescence microscopy and X-ray micro-computed tomography

Cited by 38 publications

References 22 publications

Determination of the Effect of Surface Roughness on the Bonding Strength of Wooden Materials

Determination of the Effect of Surface Roughness on the Bonding Strength of Wooden Materials

Impact of melamine and its derivatives on the properties of poly(vinyl acetate)-based composite wood adhesive

Determination of the Modulus of Elasticity of Wooden Construction Elements Reinforced with Fiberglass Wire Mesh and Aluminum Wire Mesh

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