MARINE BORERS RESISTANCE OF CHEMICALLY MODIFIED PORTUGUESE WOOD

Duarte Barroso Lopes, Carsten Mai, Holger Militz

Abstract


This study deals with the role of hardness and chemical toxicity in the resistance of pinewood tomarine borers.Portuguese wood Maritime pine (Pinus pinaster) was modified with 1,3-dimethylol 4,5-dihydroxyethylene urea (DMDHEU), methylated methylol melamine (MMF), tetraethoxysilane (TEOS) and twotypes of wax. In addition, for comparative purposes, different control species, Ipê, Beech and Blue Gumand CCA treated pine were included.All specimens were exposed over 2 years in sea (Porto, north of Portugal). Three inspections wereperformed after exposure (6, 12 and 24 months). The influence of type and level of modification as wellas hardness was evaluated.As results: Specimens modified with resin have shown slight or trace attack by Teredinids inDMDHEU with low level of modification (10% of weight percent gain, WPG); MMF resin with highand low level of modification (25% and 10% of WPG) have shown trace to moderate attack, respectively.With the TEOS and wax impregnated wood which fill the cell lumens no significant difference inmarine borers attack was found as compared to unmodified control specimens, despite the increasedhardness.

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