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The effect of extractives removal on liquid sorption, swelling and surface energyproperties of unmodified wood (UW) and thermally modified Scots pine heartwood(hW) (TMW) was studied. The extraction was performed by a Soxtec procedure witha series of solvents and the results were observed by the multicycle Wilhelmyplate method, inverse gas chromatography (IGC) and Fourier transform infrared(FTIR) spectroscopy. A significantly lower rate of water uptake was found forthe extracted UW, compared with the unextracted one. This is due to acontamination effect in the latter case from water-soluble extractivesincreasing the capillary flow into the wood voids, proven by the decreased watersurface tension. The swelling in water increased after extraction 1.7 and 3times in the cases of UW and TMW, respectively. The dispersive part of thesurface energy was lower for the extracted TMW compared to the other samplegroups, indicating an almost complete removal of the extractives. The FTIRspectra of the extracts showed the presence of phenolic compounds but also resinacids and aliphatic compounds.

Liquid sorption, swelling and surface energy properties of unmodified and thermally modified Scots pine heartwood after extraction