Application of cardanol-based unsaturated resin in wood enhanced modification
Artificial forest fast-growing wood has a high porosity,low density,and permeability.Therefore,synthetic resin can be impregnated into the interior of the wood through chemical impregnation,thereby improving the water resistance,compressive strength and other properties of fast-growing wood.This study synthesized unsaturated resin(UPR)from cardanol and used it to impregnate and enhance three types of fast-growing wood,namely poplar,fir and camphor pine.The most significant effect was on fir,with an average density increased from 0.4g/cm3 to 1.04g/cm3,compressive strength increased from 30.1MPa to 90.4MPa and water absorption rate decreased from 167.3％to 7.9％.Its chemical structure was confirmed by FTIR spectrum.The molecular weight distribution of the products in each stage of the synthetic resin was detected by gel permeation chromatography(GPC),which was convenient for predicting its structural formula.X-ray photoelectron spectroscopy(XPS)analysis showed that the UPR impregnation method mainly exhibited a decreasing trend of lateral permeability from the outside to the inside.Thermogravimetric analysis(TGA)indicated that UPR improved the thermal stability of modified wood.Through scanning electron microscopy(SEM)observation,it can be clearly seen that the internal pores of the wood were filled with resin and crosslinked,resulting in varying degrees of improvement in water resistance,compressive strength and thermal stability of the three types of fast-growing wood.
万方数据
维普
