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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.