Wood capillarity and deacetylation during eucalyptus alkaline impregnation. Sulphidity effects and comparison between transverse directions

作者：Cristina Inalbon Maria; Montagna Pablo N; Veronica Galvan Maria; Demonte Luciano; Zanuttini Miguel A^*

来源：Holzforschung, 2013, 67(1): 41-46.

DOI：10.1515/hf-2012-0030

• alkaline pre-extraction
• deacetylation kinetics
• diffusion
• effective capillarity

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 ECCSA(A) (the index A is for alkali) is estimated from the value obtained in an inert solution at room temperature (ECCSA(Inert)). The difference between radial and tangential ECCSA(A) values is constant irrespective of pH, time, temperature and the presence of sodium sulfide in the treatment liquor. The results show that ECCSA(A) 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 ECCSA(A) in both anatomical directions.

• 出版日期2013-1