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Plywood panels prepared from loblolly pine with cured phenol resin (PF) andurea-formaldehyde resin (UF) were submitted to accelerated aging and themicrostructures and mechanics of wood-resin interphase were studied bynanoindentation (NI) and nanoscale dynamic mechanical analysis (Nano-DMA). Themass loss ( ML ) of wood, PF and UF resins were 3.4, 5.0 and 4.6%after aging treatment, respectively, and a large amount of microcracks wereobserved on the surface of wood and resins after aging treatment, which alsoaffected the static mechanics of the cell walls far from the interphase regionand the resins in the interphase region. The elastic modulus( E  r ) and hardness ( H ) values ofthe cell wall decreased by 7.2 and 9.5%, respectively, against the untreatedcontrol. The storage and loss modulus of the resins decreased significantlyafter aging treatment. The significant inconsistency in the mechanics, shrinkageand swelling properties of wood cell wall and resin in the interphase regionafter aging treatment resulted in a decrease of about 47 and 51% on the averagebonding strength of the plywood made of PF and UF resins, respectively.

Effects of accelerated aging treatment on the microstructure and mechanics of wood-resin interphase