天然木质材料作为生物可降解材料，可潜在用于纤维增强复合材料的生产。本项目以木质材料为研究对象，运用原子力显微镜、纳米动态力学分析、傅立叶红外光谱等先进测试技术与手段，主要开展的研究为：①木质材料细胞壁动态粘弹性（储存模量、损耗模量和损耗正切）与含水率、温度、载荷、压痕深度、频率等因子的依存性研究，揭示木质材料细胞壁动态粘弹性测试误差及来源；②研究影响木质材料细胞壁动态粘弹性的内在因素，如木质材料细胞壁的微纤丝角、结晶度、主要化学成分、分子聚合度等的影响；③木材加工工艺对细胞壁各层动态粘弹性的影响，如树脂种类、半纤维素抽提、热处理条件等；④木质材料宏观和微观动态粘弹性性能的相互关系研究，解明木质材料细胞壁动态粘弹性的结构-性能相关性。预期成果将为具有特殊功能的木质纤维增强复合材料的研发和拓宽木材的应用领域提供重要的理论依据，对推动我国木材科学理论体系的发展具有重要的理论和现实意义。

Wood as biodegradable materials has a great potential to be used in fiber-reinforced polymer composites. In this proposed project, based on cutting-edge analytical tools such as AFM (Atomic Force Microscope), Nano-DMA (Nano-Dynamic Mechanical Analysis), FTIR (Fourier Transform Infrared Spectroscopy), mainly research goals include: ① Measuring nano dynamical mechanical properties of wood in cell wall level and analyzing potential factors for its testing, such as measuring temperature, wood moisture content, Load, indentation depth, frequency; ② Investigating effect of wood basic property on the nano dynamical mechanical property, which includes fiber microfibril angle, crystallinity, chemical composition and molecular polymerization degree, to provide basic information for tree improvement and genetical modification; ③Investigating effect of wood processing and modification on the nano dynamical mechanical property, which includes resin/matrix, removal of hemicelluloses and thermal treatment; ④ Investigating correlation between macro and micro dynamical mechanical properties and establishing the correlation structure and performance of nano dynamical mechanical properties of wood. Investigating the dynamical mechanical properties of wood in cell wall level will be very useful to develop advanced wood fiber-reinforced polymer composites and expand application for woody materials. It also has very important theoretical and practical significance to promote the development of wood science theory in China.