Kinetic of free integral swelling on chemically modified wood along the water vapour sorption isotherm under air-free conditions

Kinetic of free integral swelling on chemically modified wood along the water vapour sorption isotherm under air-free conditions. The kinetic, three-dimensional measurements of the free integral swelling were accomplished at the untreated and at the acetylated (acetyl content 8.56 %, 20.14 % and 28.63 %) fir wood (Abies alba Mill.) along the sorption isotherm under air-free conditions. The course of the swelling in the three anatomical main directions and in the transversal direction was presented for the untreated and the acetylated wood. The anti-swelling efficiency (ASE) for the accomplished modifications was estimated. The effect of the partial pressure gradient of the water vapour on the mean swelling speed was presented.