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


  • Xiaoshuai Han
  • Ren Li
  • Qinqin Zhang
  • Junwen Pu


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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Research Contributions