Furfurylation of wood seems a promising wood modification method considering the wide raw material source of furfuryl alcohol (FA) and overall performance of FA modified wood. However, the modification mechanism of furfurylation is still not clear and needs further investigation. In this study, poplar (Populus cathayana Rehd.) samples with the size of 1(R) mm × Ф4 mm, were impregnated with aqueous solutions of 10, 25, and 50% FA and then carried out the dynamic water vapor sorption experiment. From the isotherms, the moisture adsorption thermodynamic properties of FA modified wood were calculated. The results showed that: (1) the moisture sorption isotherms of FA treated wood are similar in shape to that of untreated control group, but showed significant reduction in moisture content; (2) the differential heat of sorption (QL) of FA treated wood was lower than that of control group, which can be analysed by the changed contributions of monolayer, multilayer, and capillary condensed water; (3) moisture adsorption, differential heat constant of absorption (C), absorption of monolayer (W1) and internal surface of absorption (S) decrease with increasing FA concentration.

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