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Abstract

Arti shrinkage efficiency (ASE), Increase of density and bulking efficiency values were determined on the wood samples impregnated with raonoraers I and II, and PEG-1000, which was treated with stepwise increased method, According to results, treatment with PEG-1000 gave the higest voluraetric antishrin- kage efficiency- ASE % of the Whole treatment ranged from - 11.83 % to 83.37 %. As well as, the reost effective bulking efficiency was obtained on the saiaples impregnated with PEG-1000, followed in order by styren and St-MMA treatment, respectively. In general, bulking efficiency values was found between -11.41 % and 9.124%. The incresa of density was found between 11.55 % and 57.84 %. The raost effective treatment was observed on the samples treated with St-MMA copolymer. By using scanning electron microscope (SEM) on the wood samples treated with monomers I and II, it was found out that location of polymers was cell lumen of vessels and fibers. Spectras taken frora specimens showed that there was no chemical reaction between wood and monomers. VIİI

SUHMAR1 This study deals with evaluations of treatments that ralght be considered both watsr repellents and dimensional stabilizers -Dimensional changes of wood resulting frora changes In raolsture content Is known as movement in wood. In this study, wood samples of 2,5x2,5x1,5 ca? 5-sere prepared fross Red pine. Eastern spruce. Eastern Black Sea fir. Eastern beech (Turkish beech), Black alder and black poplar Mere used. Firstly, The following raonossers were used as water repellent: Styrene (St) liquid ssonoraer, 2, 2 ' -azoblslsobutyronltryle (AIBN) - Styrene (St) liquid raonooer, Methyl snethacry late (MMA) liquid aonosser, 2,2` -exoblslsobutyronltryle (AIBN). Wood saaples Impregnated with those aonoraers were thermal ly polyaerlzed at 50 `C for 24 hours. Secondly, a 30% aqusus polyethylene glycol (PEG-1000) cas - bowaks solution was used as dimensional stabilizer. The wood sarapels was Impregnated by soaking In PEG solution for 2, T, 12 days and using stepwise Incraslng pressure method. Thirdly, after polymerization of those ssonoraers (I and II), The penetration was determined by using scanning electron microscope (SEM). As well as. Infrared (IR) spectrometer analysis «ss applied for evaluation of cheralcal reaction between wood and pclyisers. After treatoent, water repellency was evaluated for each treated and control sarapel by soaking In the distilled water for different testing tlraes (2,4,8,24,48 end, 72 hours). Hater repellency 1s expressed as vaster repellent effectiveness (WRE) calculated by measuring water uptake of impregnated wood and control saspels. It was found that St-MMA copolymer gave the highest URE. values- URE values for Bonossers I and II ranged fros 48. 70 % to 9,66%. In the application of PES-1S8S, the sost effective Impreg nation method was stepwise increasing pressure sethod of which fcIRE values ranged froas 18.16% to 68.53 %.Arti shrinkage efficiency (ASE), Increase of density and bulking efficiency values were determined on the wood samples impregnated with raonoraers I and II, and PEG-1000, which was treated with stepwise increased method, According to results, treatment with PEG-1000 gave the higest voluraetric antishrin- kage efficiency- ASE % of the Whole treatment ranged from - 11.83 % to 83.37 %. As well as, the reost effective bulking efficiency was obtained on the saiaples impregnated with PEG-1000, followed in order by styren and St-MMA treatment, respectively. In general, bulking efficiency values was found between -11.41 % and 9.124%. The incresa of density was found between 11.55 % and 57.84 %. The raost effective treatment was observed on the samples treated with St-MMA copolymer. By using scanning electron microscope (SEM) on the wood samples treated with monomers I and II, it was found out that location of polymers was cell lumen of vessels and fibers. Spectras taken frora specimens showed that there was no chemical reaction between wood and monomers. VIİI