عنوان مقاله [English]
This research was carried out to determine physical properties of beech wood impregnated with methyl methacrylate monomer. Test samples were prepared according to ASTM-D1037 standard. Samples were treated in the cylinder according to Bethel method at five concentration levels of soluble monomer methyl Metacrylate (Diluted in benzene), 0, 40, 60, 80 and 100 percent. Treated samples were heated in oven at 90ºC for 24 hours, then at 103ºC to polymerize the monomers. Monomer absorption percent, changes of weight, density, water absorption, and anti-swelling efficiency (ASE) were determined. Monomer absorption was 41.6, 46.1, 54 and 57.9% in 40, 60, 80 and 100% level. Polymer absorption (WPG), in the lowest and the highest treatment level were 5.3 and 22%. The results showed increasing levels of absorbed polymer, hydrophobicity and dimensional stability of samples treated increased. Water absorption and swelling volume of the sample saturated with a monomer of 100%, compared with the control sample, 54.3 and 63.5 were decreased after the longest immersion time. With increasing monomer absorption, density increased from 0.63 g/cm³ to 0.84 g/cm³ in control samples 84/0 at the highest level of monomer absorption. After 36 hours, anti-swelling efficiency of water-saturated samples treated at the highest level was 240.3% more than lowest level.