Wood capillarity and deacetylation during eucalyptus alkaline impregnation. Sulphidity effects and comparison between transverse directions
2012
Inalbon, María Cristina | Montagna, Pablo N. | Galván, María Verónica | Demonte, Luciano | Zanuttini, Miguel A.
The relative ion transport capacity of wood – the “effective capillary cross sectional area" (ECCSA) – is determined in this work, based on the analogy with the relation between the electrical conductivities of wood and liquid medium. Wood was treated under different conditions and then the corresponding ECCSAA (the index A is for alkali) is estimated from the value obtained in an inert solution at room temperature (ECCSAIₙₑᵣₜ). The difference between radial and tangential ECCSAA values is constant irrespective of pH, time, temperature and the presence of sodium sulfide in the treatment liquor. The results show that ECCSAA is dependent on the degree of removal of native acetyl groups from hardwood O-acetyl-glucuronoxylan. A kinetic expression for Eucalyptus wood deacetylation is validated and used to establish the relationship between the acetyl content and ECCSAA in both anatomical directions.
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