Effects of polyvinyl alcohol on leachability and efficacy of boron wood preservatives against fungal decay and termites attack

Mohareb Ahmed, Thévenon Marie-France, Wozniak Edmond, Gerardin Philippe. 2010. Effects of polyvinyl alcohol on leachability and efficacy of boron wood preservatives against fungal decay and termites attack. In : 41st Annual Meeting of the International Research Group on Wood Protection, Biarritz, France, 9-13 May 2010. IRG. s.l. : s.n., 10 p. Annual Meeting of the International Research Group on Wood Protection. 41, Biarritz, France, 9 Mai 2010/13 Mai 2010.

Résumé : In this study, the use of polyvinyl alcohol (PVA) as boron fixative agent was investigated. Two levels of PVA (2.5 and 4%) were evaluated with disodium octaborate tetrahydrate (DOT) at three concentrations (1, 2 and 4% boric acid equivalent (BAE) using a double vacuum impregnation processes on Scots pine sapwood specimens. Leaching was performed according to a laboratory leaching procedure. Boron analysis using atomic absorption spectrometer showed a significant reduction in boron leachability for the samples treated with both concentrations of PVA when compared to the stand-alone boron treatment leading to boron retentions capable to prevent wood biological degradations. Decay resistance of the leached specimens was evaluated using the brown rot fungus Poria placenta. Even if complete protection was not fully achieved, an improvement of decay resistance was observed for the samples treated with DOT in presence of PVA. This leak of efficacy was attributed to a decrease in the biological activity for the complexed boron against fungi. Durability of treated wood against termites attack, evaluated using Reticulitermes santonensis, indicated a significant enhancement for the samples treated in presence of the fixative agent comparatively with the pure boron treatment.

Mots-clés Agrovoc : produit de préservation du bois, bois, acide borique, acétate de polyvinyle, Termitidae, Reticulitermes, Pinus sylvestris, Postia placenta

Mots-clés complémentaires : Reticulitermes santonensis

Classification Agris : K50 - Technologie des produits forestiers
J12 - Manutention, transport, stockage et conservation des produits forestiers

Auteurs et affiliations

• Mohareb Ahmed, Alexandria University (EGY)
• Thévenon Marie-France, CIRAD-PERSYST-UPR Bois tropicaux (FRA)
• Wozniak Edmond, Dyrup (FRA)
• Gerardin Philippe, ENGREF (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/561790/)

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