Wood Science and Technology

, Volume 45, Issue 3, pp 407-417

First online:

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

  • Ahmed MoharebAffiliated withDepartment of Forestry and Wood Technology, Faculty of Agriculture, 21545-El-Shatby, Alexandria University
  • , Marie France ThévenonAffiliated withLaboratoire de préservation des bois, CIRAD PERSYST, UPR 40
  • , Edmond WozniakAffiliated withDyrup S.A.S, Zone Industrielle Montplaisir
  • , Philippe GérardinAffiliated withLaboratoire d’Etudes et de Recherche sur le Matériau Bois, EA 4370, IFR 110, Nancy Université Email author 

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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 process 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 of preventing 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 in 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 of the complexed boron against fungi. Durability of treated wood against termite attack, evaluated using Reticulitermes santonensis, indicated a significant enhancement for the samples treated in presence of the fixative agent compared to the pure boron treatment.