Effect of Impregnation with a Low-Concentration Furfuryl Alcohol Aqueous Solution on Hygroscopic Properties of Chinese Fir and Poplar Wood

Furfurylation with a low concentration of furfuryl alcohol (FA) promotes the improvement properties and effectiveness FA on cell–wall action without darkening furfurylated wood to point that it affects its applications. In this paper, effects furfurylation hygroscopicity water uptake dimensional stability poplar (Populus sp.) Chinese fir (Cunninghamia lanceolata) were analyzed. Meanwhile, distribution resin, relationship between water, change in pore size distribution, weight percentage gain cell wall bulking coefficient also investigated. The results as follows: (1) A could better enter walls than poplar, resin was almost cured secondary walls, corners, compound middle lamellae when 10% applied poplar. When increased 30%, there no significant increases amount entering amounts lumen greater those fir. modification more suitable (2) pointed ends pit chambers apertures (800–1000 nm) small pores membranes (1–6 μm) partially deposited by which formed new ranges 80–600 nm 15–100 nm, respectively. porosity fir, bulk density less before after modification. (3) able reduce equilibrium moisture content, improve anti-swelling efficiency, enhance compared effectively reduced due hydrophobic property resin. 17%–19% second cyclic soaking treated various concentrations, indicated loss leaching during test. Low-field NMR used demonstrate not only but affected combination state bound free wood. Thus, at is feasible method extend applications