Fungal Decay Resistance and Dimensional Stability of Loblolly Pine Reacted with 1,6-Diisocyanatohexane
Keywords:
Cross-linked wood, 1, 6-diisocyanatohexane, fungal resistance, dimensional stability, loblolly pine, Gloeophyllum trabeum, Pinus taedaAbstract
Wood reacted with 1,6-diisocyanatohexane resisted fungal attack and had improved dimensional stability. At 25.8% chemical weight gain, the reacted wood had no weight loss by the brown-rot fungus Gloeophyllum trabeum; at 20.9% and 23.8% chemical weight gains, the reacted wood had antishrink efficiencies (ASEs) of 58% and 61%, respectively, with a small loss of 3% ASE after four cycles of water swelling and drying treatment. At 26.1% chemical weight gain, the reacted wood lost 5.8% bonded diisocyanate in a 12-week soil-block decay test. Evidence of cross-linking between wood and 1,6-diisocyanatohexane was provided by the characteristic carbamate infrared absorption. In the absence of water, 1,6-diisocyanatohexane reacted with wood to form cross-linking wood as the only product; in the presence of water, diisocyanate reacted preferentially with water to form mainly ureas with a small amount of biurets. These chemicals were deposited in the cell lumen of wood. Water vapor sorption of wood reacted with 1,6-diisocyanatohexane indicated that the decay resistance of this modified wood is probably due to the inability of the modified cell wall of wood to absorb sufficient water to support decay.References
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