为实现纸浆纤维表面的疏水改性,利用木素磺酸盐（LS）与Cu ^2＋层层自组装的方式对纸浆纤维进行了表面修饰.通过X射线光电子能谱分析、原子力显微镜分析以及动态接触角测量的方法对自组装后的纤维表面进行了分析和表征.结果表明：纤维表面S和Cu的含量随着LS与Cu ^2＋的交替组装而增加,说明LS和Cu ^2＋在纤维表面的层层自组装是可行的;随着层层自组装的进行,纤维表面的微细纤维逐渐被木素致密覆盖;表面木素的增加致使AFM相图的平均相位逐渐增大,使表面疏水性提高;纤维的初始接触角随着自组装层数的增加而增大,且一定时间（0.08 s）内接触角的下降速率减小;组装5层木素后,纤维表面的初始接触角由0°提高至104.8,°0.08 s后下降至78.9°,表面由高度亲水性变为具有一定疏水性.由此可得出结论：通过控制SL自组装的层数可以有效且可控地实现纸浆纤维的疏水改性.

Layer-by-layer（LbL） self-assembly of lignosulfonates（LS） and Cu ^2＋ was applied to the hydrophobic modification of pulp fiber surface.The modified fiber surface was then characterized by means of X-ray photoelectron spectroscopy,atomic force microscopy（AFM） and dynamic contact-angle measurement.The results show that  the contents of S and Cu on fiber surface both increase with the alternate assembly of LS and Cu ²⁺ ,which veri-fies the feasibility of the LbL self-assembly of lignosulfonates on fiber surface ； the microfibrils on fiber surface are gradually and compactly covered by granular lignin particles during the process of self-assembly  the ave-rage phase of AFM phase images increases with the content of lignin on fiber surface,which suggests the improvement of the hydrophobicity of fiber surface  with the increase of self-assembly layers,the initial contact angle of fiber surface increases and the decline rate of contact angle decreases in a period of 0.08s;and  the initial contact angle increases from 0° to 104.8° after the fiber surface has been modified with five self-assembly layers,and then decreases to 78.9° after 0.08s,which means that the excessively hydrophilic fiber surface is modified to a hydrophobic one in a certain degree.It is thus concluded that the hydrophobic modification of fiber surface can successfully be implemented by controlling the number of assembled layers.