中文摘要：

以大青杨木材为研究对象,为提高其抗润湿和耐老化性能,采用层层自组装技术,将聚乙烯亚胺（PEI）和纳米ZrO2交替吸附在木材表面,然后用全氟癸基三甲氧基硅烷（FAS）对组装后的木材进行修饰,在木材表面形成复合的功能薄膜。结果表明,在组装过程中,纳米ZrO2的单斜晶系晶体结构没有发生转变。（PEI/ZrO2）i膜层能均匀地负载在木材表面,随着层数的增加,膜层变得更加致密。接触角测试结果发现,与未处理材相比,组装后的木材试样经过FAS修饰后均具有较稳定的疏水效果,初始接触角最高可达148°。加速老化试验结果表明,未处理材的颜色变化ΔE＊可达35.36,而处理后木材的ΔE＊明显减小,降幅达到66.4%。因此,利用层层自组装技术,在木材表面吸附了（PEI/ZrO2）i/FAS膜层,可使木材具有良好的抗润湿及耐老化效果。

英文摘要：

Wood is widely used in construction and furniture fields as a sustainable and natural polymer material. However, some drawbacks such as hygroscopic swelling and aging discoloration have limited its applications. It is necessary to improve the anti-wettability and aging resistance performance for the Populus ussuriensis wood during the utilization. In this study, the polyethyleneimine （PEI） and nano-zirconium dioxide （ZrO2 ） were alternately adsorbed on wood surface via layer-by-layer assemble method. Then, the assembled wood samples were treated with low-surfaceenergy 1H, 1H, 2H, 2H-Perfluorodecyltrimethoxysilane （FAS）, which formed composite （PEI/ZrO2 ）/FAS coatings on wood surface. The results of XRD curves indicated that, compared with the untreated wood, the monoclinic crystal structure of ZrO2 emerged from the assembled wood samples. The diffraction peak intensity of ZrO2 on wood surface enhanced obviously with the increase of assembled layer number, and the crystal structure remained un- changed. Field emission scanning electron microscope （FE-SEM） images showed that （PEI/ZrO2 ）icoatings were well-distributed and consecutive on wood surface, and became denser with the increase of layer number. The results of water contact angle measurements demonstrated that the untreated wood was hydrophilic, however, the wood samples with （PEI/ZrO2 ）/FAS coatings retained stable hydrophobic effect. The original contact angle reached 148°, and the changes were not obvious afterwards. Then, wood samples alternately exposed under the UV irradiation and wet environment for artificial accelerated aging test. When the irradiation time reached 600 h, the total color change （ ΔE＊ ） of the untreated wood was calculated to be 35.36. Owing to the good ultraviolet absorption and reflection performance of ZrO2, ΔE＊ of the treated wood samples significantly decreased with the increase of assembled layer number. For the （PEI/ZrO2）20/FAS wood sample, ΔE＊ was 11.87, which was decreased by 66.4