Structure–property relationships in one‐component polyurethane adhesives for wood: Sensitivity to low moisture content

Beaud, F.; Niemz, Peter; Pizzi, A.

doi:10.1002/app.24334

Cited by 29 publications

(9 citation statements)

References 10 publications

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“…The tests on acetylated samples in dry conditions did not reveal any significant differences neither in TSS nor in WFP to the values of the unmodified samples for any of the three tested adhesives. For PUR, which requires a minimum moisture content of about 6-8% for good bonding performance (Beaud et al 2006), the lower moisture sorption of acetylated rubberwood did not impair the bonding performance tested in dry conditions, which is in agreement with previous studies (Bongers et al 2016;Vick et al 1993). Therefore, the bonding performance of the tested adhesives and of wood is not influenced by acetylation in dry condition (Vick and Rowell 1990).…”

Section: Tensile Shear Strength and Wood Failure Percentage Of Bondedsupporting

confidence: 88%

Quasi-static and fatigue performance of bonded acetylated rubberwood (Hevea brasiliensis, Müll. Arg.)

et al. 2020

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Rubberwood is widely planted for latex production. At the cessation of latex yield it becomes a viable timber source in the wood industry. While good bonding performance of rubberwood has been reported, quantitative information to support this statement is missing. In this study, the tensile shear strength (TSS) and wood failure percentage (WFP) of unmodified and acetylated rubberwood in both wet and dry conditions were examined. Three frequently used adhesives were selected: one-component polyurethane (1C PUR), melamine-urea-formaldehyde (MUF), and phenol-resorcinol-formaldehyde (PRF). Furthermore, fatigue behaviour was analysed for PRF-bonded samples by cyclic loading. Results showed that in dry state, the TSS and WFP of acetylated rubberwood is comparable to the unmodified samples for all adhesives. In wet condition, the performance of bonded rubberwood was improved by acetylation. Cyclic loading revealed comparable fatigue behaviour of bonded unmodified and acetylated rubberwood. This investigation provides first quantitative information on the performance of bonded rubberwood, which can be a valuable input for the production of laminated timber products for structural purposes.

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Section: Tensile Shear Strength and Wood Failure Percentage Of Bondedsupporting

confidence: 88%

Quasi-static and fatigue performance of bonded acetylated rubberwood (Hevea brasiliensis, Müll. Arg.)

et al. 2020

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“…One of the most important wood composites is plywoods laminated materials. Initially thermosetting glues based on phenol-fonnaldehyde, amino-formaldehyde, melamine-formaldehyde, as well as epoxy and urethane resins were used in the production of coniferous plywoods and other sheet materials [1,2].…”

Section: Introductionmentioning

confidence: 99%

Use of innovative environmentally friendly adhesives for wood veneer bonding

Kajaks¹,

Reihmane²,

Grīnbergs³

et al. 2012

Proc. Estonian Acad. Sci.

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“…PUR may be classified as pre-polymerised adhesive with large average molecular weight components. However, depending on the specific type of PUR, a wide distribution of properties is possible [5] . UF on the other hand belongs to the group of in-situ polymerised adhesives.…”

Section: Introductionmentioning

confidence: 99%

Evaluating fundamental position-dependent differences in wood cell wall adhesion using nanoindentation

Obersriebnig¹,

Konnerth²,

Gindl‐Altmutter³

2013

International Journal of Adhesion and Adhesives

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Spruce wood specimens were bonded with one-component polyurethane (PUR) and urea-formaldehyde (UF) adhesive, respectively. The adhesion of the adhesives to the wood cell wall was evaluated at two different locations by means of a new micromechanical assay based on nanoindentation. One location tested corresponded to the interface between the adhesive and the natural inner cell wall surface of the secondary cell wall layer 3 (S3), whereas the second location corresponded to the interface between the adhesive and the freshly cut secondary cell wall layer 2 (S2). Overall, a trend towards reduced cell wall adhesion was found for PUR compared to UF. Position-resolved examination revealed excellent adhesion of UF to freshly cut cell walls (S2) but significantly diminished adhesion to the inner cell wall surface (S3). In contrast, PUR showed better adhesion to the inner cell wall surface and less adhesion to freshly cut cell walls. Atomic force microscopy revealed a less polar character for the inner cell wall surface (S3) compared to freshly cut cell walls (S2). It is proposed that differences in the polarity of the used adhesives and the surface chemistry of the two cell wall surfaces examined account for the observed trends.

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Structure–property relationships in one‐component polyurethane adhesives for wood: Sensitivity to low moisture content

Cited by 29 publications

References 10 publications

Quasi-static and fatigue performance of bonded acetylated rubberwood (Hevea brasiliensis, Müll. Arg.)

Quasi-static and fatigue performance of bonded acetylated rubberwood (Hevea brasiliensis, Müll. Arg.)

Use of innovative environmentally friendly adhesives for wood veneer bonding

Evaluating fundamental position-dependent differences in wood cell wall adhesion using nanoindentation

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