Abstract:

The method of ClO₂ delignification was used to decolorize and control the structure of fast-growing poplar. Under the condition of ensuring the intact shape of poplar board, the effects of treatment time on the structure and chemical components of fast-growing poplar were explored, and then the decolorized poplar was modified by polymethylacrylic resin(PMMA) impregnation. It was found that the brightness was 83.2% and decolorization was uniform after being treated with ClO₂ for 3 h, the shape of the poplar board remained intact, the porosity increased from 11.8% to 31.4%, which effectively improved the pore passage of poplar. After being impregnated with polymethylacrylic resin, the decolorized poplar had beautiful appearance and good dimensional stability, and its mass increase rate, density and strength increased from 32.1%, 0.40 g/cm³ and 32.8 MPa of log to 80.5%, 1.48 g/cm³ and 87.4 MPa, respectively, which were more than 2.5 times of those of log.

Key words: fast-growing poplar, chlorine dioxide, structural control, polymethylacrylic resin, transparent wood