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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.

holz als roh- und werkstoff

Physical and mechanical properties of plywood produced with 1.3-dimethylol-4.5-dihydroxyethyleneurea (DMDHEU)-modified veneers of Betula sp. and Fagus sylvatica