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Mechanical properties and decay resistance of Scots pine (Pinus sylvestris L.) sapwood modified by vinyl acetate-epoxidized linseed oil copolymer

Cai, Shengzhen, Jebrane, Mohamed, Terziev, Nasko, Daniel, Geoffrey
Holzforschung 2016 v.70 no.9 pp. 885-894
Basidiomycota, Pinus sylvestris, cell walls, climate, composite polymers, decay resistance, durability, equilibrium moisture content, fungi, laboratory experimentation, linseed oil, mechanical properties, microscopy, resin canals, sapwood, vinyl acetate, wood
Equilibrium moisture content (EMC), mechanical properties, and durability of Scots pine (Pinus sylvestris L.) sapwood modified by vinyl acetate epoxidized linseed oil (WVA₋ELO) have been studied. Microscopic observations revealed that the impregnated copolymer is mainly in cell walls, rays, resin canals, and a small fraction in the cell lumens. Under the same climate conditioning, the EMC of the treated wood was in the range of 6.0%–8.2%, which was significantly lower than that of untreated wood (about 12%). Mechanical tests performed on paired samples (control and treated) showed a slight reduction on the mechanical properties of WVA₋ELO. The decay resistance against basidiomycete fungi of WVA₋ELO was significantly improved as demonstrated by laboratory tests. It was found that 8% weight percentage gain (WPG) was sufficient to ensure decay resistance against the test fungi with <5% mass loss (ML), which led to durability class (DC) of 2.