Recently, Scots pine wood has received tremendous attention in China because of its high strength weight ratio and aesthetic grain pattern.However, there are some disadvantages for Scots pine such as its low density, inferior mechanical strength, and low dimensional stability. In the present research, Scots pine has been impregnation by pulse dipping at 0.7-0.8 MPa for 150 minutes with urea formaldehyde prepolymer, 1,3-dimethylol-4,5-dihydroxyethyleneurea and sodium silicate sol, and the sodium silicate sol has been cured within the wood micropores by in situ gel polymerization by kiln drying, so that a Si-O-Si framework can be deposited inside the wood structure. The mechanical properties and dimensional stability of the modified wood were investigated, and the water absorption decreased from 121.13 to 59.13. The Fouriertransform infrared spectroscopy showed the chemical changes in wood after modification and illustrated the modified mechanism. The thermogravimetric analyzer showed that the thermal stability of modified wood improved. Finally, scanning electron microscopy and energy dispersive analysis of X-rays micrographs proved that the good interfacial adhesion of modifier between wood fiber and polymer.
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