Impregnation of Scots Pine with Compound Modifier and Induction of In-Situ Polymerization by Heating
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 ureaformaldehyde
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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