【摘要】 本研究用一种简单、通用、快速的化学表面改性方法对木材进行疏水改性，制备的木材试件具有优异的疏水性能，具有拓展低值人工林木材应用范围的潜在能力。利用单宁酸（TA）与三价铁离子（Fe^Ⅲ）配位形成的TA-Fe^Ш复合涂层的粘附性以及TA中游离邻苯二酚/邻苯三酚良好的还原能力，将金属Ag离子原位还原为Ag纳米颗粒，在木材表面构建良好的粗糙度；随后，在复合涂层上接枝疏水长链，从而制备出疏水型木材。结果表明，随着自组装次数的增加以及还原的Ag纳米颗粒在木材复合涂层的沉积，使得木材表面的粗糙结构得到了适度的发展。未改性木材表面的接触角为52.0°,随着接触时间延长，接触角迅速下降，水滴很快渗入到木材中；而经过改性处理的木材，随着自组装次数的增加，TA-Fe^III/木材试件的接触角从138.2°增加至近143.7°;TA-Fe^III/Ag/木材试件的接触角从142.3°增加到了146.7°,使木材具有了优异的疏水性能。在强酸、强碱、有机溶剂、超声波清洗和紫外线老化等恶劣条件下，疏水木材接触角均高于135.0°,制备出的疏水木材表现出了优异的环境稳定性和化学耐久性。更多还原

【Abstract】 In order to strengthen and widen the application of low-quality wood species, a simple, general, and efficient chemical surface treatment procedure was proposed to modify low quality wood, which could construct wooden hydrophobic interface on the surface of specimens.In situ reduction of metallic Ag ions to Ag by utilizing the adhesion of the TA-Fe^Ⅲ composite coating formed by the coordination of tannic acid（TA）and ferric ions(Fe^Ⅲ)and the good reducing ability of free catechol/pyrogallol in TA Nanoparticles, build good roughness on the wood surface, and then graft hydrophobic long chains on the composite coating to prepare hydrophobic wood.With the further growth of hydrophobic chains along the composite coatings, the wood specimens with excellent hydrophobic properties could be prepared accordingly.The results show that with the increase of self-assembly times and the deposition of reduced Ag nanoparticles in the wood composite coating, the rough structure of the wood surface is well developed.The contact angle of the unmodified wood surface was 52.0°,and with the prolongation of the contact time, the contact angle decreased rapidly, and the water droplets quickly penetrated into the wood; while the modified wood, with the increase of self-assembly times, the contact angle of TA-Fe^Ⅲ/wood specimens increased from 138.2° to 143.7°;the contact angle of TA-Fe^Ⅲ/Ag/wood specimens increased from 142.3° to 146.7°,which made the wood has excellent hydrophobic properties.Under harsh conditions such as strong acid, strong alkali, organic solvent, ultrasonic cleaning and ultraviolet aging, the contact angle of hydrophobic wood is higher than 135.0°,and the prepared hydrophobic wood shows excellent environmental stability and chemical durability.更多还原