Abstract
The interaction between wood,Pinus sylvestris (60% RH), and polyethyleneglycol (PEG) of different molecular weights (PEG 200 and PEG 1500), pentaerythritol and glycerol, impregnated into wood, has been investigated using Scanning Electron Microscopy (SEM), dynamical mechanical techniques (DMTA), X-ray diffraction (WAXS) and macroscopic dimensional measurement. Reduced dimensional changes after impregnation, in environments with changing moisture content, show that the stabilization effect of glycerol impregnation is very good. The other chemicals used, especially pentaerythritol, were not as effective as glycerol. Cell wall measurements, using SEM, show that an increase in cell wall thickness gives a corresponding increase in stabilization effect. DMTA-measurements show that interaction between wood molecules and the chemicals used differs. In general, a higher degree of cell wall penetration of the chemicals show a better stabilization effect. PEG 200 was found to penetrate the cell wall much better than PEG 1500. WAXS-investigations show free crystalline pentaerythritol, PEG 1500, glycerol and PEG 200.
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