Abstract: Poplar is one of the most important fast-growing forest species in China. It has the characteristics of short rotation period, strong adaptability, low price and ease of obtaining. But it also has some shortcomings, such as loose fiber structure and relatively poor material, which elevates the difficulty of high-value utilization in furniture. Impregnation modification of poplar to enhance its performance can not only improve the utilization rate of poplar, but also help to solve the problem of materials shortage in solid wood furniture production. The permeability of wood is an important factor determining the impregnation effects. The methods to enhance the permeability of poplar include steaming treatment, boiling treatment, microwave pretreatment, compressed air micro-blasting treatment and so on.The main agents used in the impregnation modification of poplar wood are divided into organic modifier, inorganic modifier and organic-inorganic composite modifier, and different agents have diverse impregnation effects. Organic modifiers are easy to realize chemical combination with wood fibers and therefore have strong fixation, but they are also detrimental to the bonding and finishing effects and prone to emit toxic and harmful substances. Inorganic modifiers are green and environmentally friendly, but inferior in loss resistance. The organic-inorganic composite modifiers combine the advantages of organic and inorganic ones, and eliminate the both disadvantages, so they have become the focus of current research. The impregnation process also has a significant impact on the modification effect. Atmospheric pressure impregnation enjoys low cost and simple operation but is limited in impregnation efficacy. Vacuum pressure impregnation is time-saving and highly effective, and hence has wide application. In addition, the process parameters, such as impregnation time and pressure, greatly influence the impregnation depth and weight gain rate. This review summarizes the global research progress of the above technical issues related to the impregnation modification of poplar. It also gives a property-based discussion about the status quo and prospect of the application of modified poplar wood in furniture production.
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