超疏水改性是提高木材尺寸稳定性的有效途径，但目前以无机粒子堆积构建的疏水木材表面存在机械强度弱，稳定性差等问题，归因于尚未能从微观尺度和纳米力学层面揭示其表面结构的破坏机制和增强机理，导致难以制备稳固的超疏水木材。本项目基于纳米力学手段从微观角度模拟分析超疏水木材表面宏观破坏进程，采用“生物质废料”—木质素为结构材料，自组装形成木质素纳米微球（LNP）和以纳米纤维素晶须（CNC）为骨架复合形成LNP/CNC棒珠，对比用胶粘剂预处理再植入LNP和LNP/CNC棒珠构建的超疏水木材表面，利用纳米压/划痕技术模拟超疏水木材表面的宏观机械强度测试以及表征其纳米力学强度，从微观尺度揭示其表面结构的破坏机制，阐明木材-胶-微纳结构多层界面结合方式对其强度和稳定性的影响规律，从而建立棒珠式超疏水木材表面的增强和稳固机理，为突破超疏水木材产业化瓶颈及实现木材尺寸长久稳定提供关键理论和技术参考。

Superhydrophobic modification is an effective way for wood to keep its dimension stable. However, superhydrophobic wood surfaces which are commonly built by accumulation of inorganic nanoparticles still exist such problems as poor mechanical strength and stability. That’s attributed to a lack of destroying theory and enhancement mechanism from microscopic scale and nanomechanical level on superhydrophobic wood surfaces, making it difficult to construct firm and durable superhydrophobic wood surfaces. In this project, it is tried to simulate and analyze the macroscopic destroying process of superhydrophobic wood surfaces with nanomechanics from microscopic view. Ligin-“biomass waste” is used as the main structural material. Lignin nanoparticle (LNP) could be prepared by self-assembly of lignin and LNP/CNC rod-bead is formed when LNP grow on nanocellulose crystal (CNC) which is used as skeleton. To make a comparation of the superhydrophobic wood which are prepared by treatment of adhesive on wood surfaces and then introduction of LNP or LNP/CNC, nano indentation/scratching technologies are used to simulate macroscopic mechanical strength test and to characterize the nanomechanical strength, revealing the destroying theory of the accumulation structure of inorganic nanoparticles and illustrating the influence of combination way of multi-layer interfaces with wood-rubber-micro/nano structure on its strength and stability from microscopic scale. Sequentially, enhancements and stablity mechanism of the microstructure on superhydrophobic wood surfaces is established, providing key theoretical and technical reference for breakthrough of the industrialization bottlenecks and good dimension stability of superhydrophobic wood.