EFFECTS OF NANO-SiO2/POLYETHYLENE GLYCOL ON THE DIMENSIONAL STABILITY MODIFIED ACQ TREATED SOUTHERN PINE

Southern yellow pine (Pinus sp.) wood cubes were vacuum-pressure treated with nanoSiO(2) solution and different concentrations of ACQ/polyethylene glycol (05%, 2.5% and 5.0%) modified solutions. The effects of polyethylene glycol concentrations and nano-SiO2 addition on the water absorption, air drying shrinkage and moisture swelling stability of treated wood were investigated. The results showed that during the whole process of water absorption and air drying shrinkage, the better stability of nano-SiO2 modified ACQ treated wood could only be obtained with the ratio of 2.5% polyethylene glycol addition. However, nano-SiO2 and polyethylene glycol modification could take little effect on the moisture and water swelling resistance of treated wood with different treatments.