Abstract
The dimensional stability and some mechanical properties were tested in plywood produced with veneers modified with 1.3-dimethylol-4.5-dihydroxyethyleneurea (DMDHEU). The experimental design included Betula sp. and Fagus sylvatica impregnated with 0.8 M, 1.3 M, and 2.3 M DMDHEU. The plywood consisted of five veneers glued with a phenolic resin. Dimensional stability tests were conducted after 10 cycles of soaking/oven-drying to determine volume changes and anti swelling efficiency (ASE). The mechanical properties tested were hardness (Brinell), modulus of elasticity in bending (MOE), bending strength (BS) and work to maximum load in bending (WMLB). The modified samples for both species were considerably more dimensionally stable than the untreated samples. The samples of Betula sp. and F. sylvatica modified with DMDHEU presented a MOE and a BS unaffected by the treatment. The WMLB was consistently lower in the modified samples than in the unmodified samples. As determined by the Brinell method, the DMDHEU-modified plywood of the Betula sp. and F. sylvatica was harder than the unmodified plywood.
Zusammenfassung
Die Dimensionsstabilität und einige ausgewählte mechanische Festigkeiten wurden an Sperr- hölzern getestet, die aus mit 1.3-Dimethylol-4.5-Dihydroxyethyleneurea (DMDHEU) modifizierten Furnieren hergestellt wurden. Es wurden Birken- (Betula sp.) und Buchenfurniere (Fagus sylvatica) verwendet, welche mit 0.8 M, 1.3 M sowie 2.3 M DMDHEU Lösung imprägniert wurden. Die aus 5 Lagen bestehenden Sperrhölzer wurden mit einem Phenolharz verklebt. Zur Untersuchung der Dimensionsstabilität wurden die Prüfkörper über 10 Zyklen wassergesättigt und anschließend bei 103 °C getrocknet. Aus den Volumenänderungen wurde anschließend die Quellungsvergütung (ASE) bestimmt. Des Weiteren wurden die Härte nach BRINELL, der Elastizitätsmodul während der Biegeprüfung (MOE), die Biegefestigkeit (BS) sowie die Biegearbeit (WMLB) bestimmt. Die Prüfkörper aus den modifizierten Sperrhölzern beider Holzarten zeigten eine höhere Dimensionsstabilität als die Prüfkörper aus unmodifizierten Sperrhölzern. Der Elastizitätsmodul und die Biegefestigkeit wurden durch die Modifizierung nicht beeinflusst. Die Biegearbeit wurde durch die Modifizierung verringert, die Härte erhöht.
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Dieste, A., Krause, A., Bollmus, S. et al. Physical and mechanical properties of plywood produced with 1.3-dimethylol-4.5-dihydroxyethyleneurea (DMDHEU)-modified veneers of Betula sp. and Fagus sylvatica . Holz Roh Werkst 66, 281–287 (2008). https://doi.org/10.1007/s00107-008-0247-3
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DOI: https://doi.org/10.1007/s00107-008-0247-3