Abstract:

Applying water, formamide and diiodomethane, as probe liquids to penetrate into pine wood at its capillary and non-capillary sections, respectively, the dynamic absorption models of wood had been deduced based on recorded absorption curves. Results showed that wood absorbs liquid in both capillary and non-capillary sections following three steps, I.e. both the initial and final steps followed the zero order adsorption rate, while the bulk step was complexly dominated by a first or second order adsorption rate. Moreover, it was also found that the viscosity, polarity and the Lewis acid-base interactions of liquids were main factors to influence wood absorption.

Key words: wood, absorption, capillary, liquid