Influence of Chemical Treatment on Chemical Changes of Fir Wood

Abstract:

Many chemicals are used to prolong wood lifetime and protect wood against wood-destroying organisms and fire but there is not sufficient information about their possible corrosive effects on wood and its structural components from the perspective of long-term exposition in unsuitable condition. This study evaluated the combined effects of inorganic chemicals (borates, phosphates containing ammonia, sulphates with metal cations, chlorides) and wet-thermal accelerated ageing (T=80 °C, RH=65 %, for 30 days) on chemical composition of treated wood. Used analyses indicated that selected chemicals cause a decomposition of all wood constituents in varying degrees. Cellulose was degraded in the greatest extent due to acidic sulphates (Fe³⁺, Cu²⁺) and almost no deterioration of polysaccharides was caused with H₃BO₃. A negative effect on lignin had almost only Na₂B₄O₇.10H₂O and NaCl. At the same time the amount of extractives in hot water and acetone and ash content were compared at all samples. The wet-thermal ageing played an important role in wood degradation, but the effect of chemical treatment was certainly stronger.

• Periodical: Key Engineering Materials (Volume 688)
• Pages: 38-43
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.688.38
• Online since: April 2016
• Authors: Tereza Tribulová*, František Kačík, Dmitry V. Evtuguin, Iveta Čabalová
• Keywords: Accelerated Ageing, Ash Content, Extractives, Firewood, Inorganic Salts, Lignin, Polysaccharides

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