Abstract: As a natural material, wood plays an indispensable role in industrial production and daily life. China has always been a major producer and consumer of wood and its products. In recent years, the implementation of natural forest protection projects has further enlarged the insufficiency of wood supply, which intensifies the contradiction between the supply and demand of wood. In order to increase the supply of wood resources, China has made great efforts to develop artificial fast-growing forests with short production time and high yield. However, artificial fast-growing forest has many disadvantages such as loose material structure, low density, low strength, poor corrosion resistance and poor dimensional stability, which result in poor product performance and low added value. The modification of fast-growing wood can improve its physical and mechanical properties, broaden its scope of application, and relieve the contradiction between the supply and demand of wood. The modification of wood by chemical agents can not only overcome the original deficiencies of natural wood, especially the fast-growing wood, improve their physical and mechanical performance, but also endow natural wood with specific properties like aging resistance, fire resistance and hydrophobicity, thus increases the commercial value and realizes the efficient utilization of the wood. Chemical modification has been recognized as an efficient strategy for dimensionally stabilizing wood and protecting it from environmental damage. In recent decades, the researches on chemical modification of wood has attracted great attention worldwide. Chemical modification of wood is a technique that the wood can be impregnated with modified agent thanks to its porous structure and then chemical curing occurred at the heat treatment or catalyst. It is universally known that only chemical modifiers penetrate into the cell wall and are locked inside the cell can wood properties be improved significantly. Therefore, aiming at improving wood properties, intensive research endeavors have been paid to seek favorable coupling agent and optimize fabrication process. In the chemical modification of wood, only acetylation, resin modification and furfurylation treatment have been successfully realized large-scale commercial production. Acetylation and furfurylation treatment can meet the requirements of cell wall modification. Coupling agents such as glycidyl methacrylate, acrylic acid and maleic anhydride are usually added to improve the binding ability between modifier and wood cell wall. Recently, two-step treatment are introduced into the cell wall modification process. At present, the chemical modification of wood has realized the precise control of cell wall modification, and the dimensional stability improvement with low weight increment. In this paper, the development and the state of the wood chemical modification at home and abroad are reviewed.The typical modification techniques including thermoset resins, wax, organic monomer, acetylation, furfurylation and N-methylolcompounds modification are introduced. The principle and properties of chemical modification on the fast-growing wood are analyzed. Finally, the current existing problems in the chemical modification of wood and the future development trend are discussed.
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2018, Vol. 32 
