Influence of the extractives of selected extraneous woods on the equilibrium moisture content | Einfluss des Extraktstoffanteils ausgewählter fremdländischer Holzarten auf deren Gleichgewichtsfeuchte
2006
Popper, Rudolf | Niemz, Peter | Torres, Marco
The water vapour sorption behaviour of 13 different tropical wood species was examined. The experimentally determined values were analysed with the Hailwood–Horrobin sorption model. According to the Hailwood–Horrobin model the following characteristic values were computed: the monomolecular Uₘ and polymolecular Uₚ sorption, the fiber saturation point Ufₛ, the inaccessibility Z of the sorbent to the sorbate as well as the specific surface of the sorbent Σ. Very large differences exist in the sorption behaviour between the individual wood species. In particular for Canalete (22.8%), Wengé (20.3%) and Doussié (17.8%) a very low fiber saturation point was determined, which is clearly below the values of European wood species (28%–32%) and other examined tropical woods. The ethanol toluol extract of the wood correlates with the moisture content of the polymolecular Uₚ and total Uₜₒₜ sorption. The higher the extractives content the lower the equilibrium moisture content Uₜₒₜ and Uₚ. The extractives show no influence on the monomolecular-bound water Uₘ. The chemisorption remains therefore uninfluenced by EtOH–toluol extractives. The reduction of the sorption capacity by rising EtOH–toluol extractive content is due to the bulking effect.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library