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.
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