木材细胞壁定向原位纤丝化及其网络结构重组机制研究

木材细胞壁组分精准解离与结构定向调控是木材改性、功能重组、木质先进复合材料开发的基础，对于木材提质增效利用具有重要意义。针对木材细胞壁组分精准解离机制模糊，细胞壁微纳结构定向调控方法缺乏等基础科学问题，本项目拟通过化学解聚、表面电荷调控等方法系统研究杉木、杨木等针/阔叶材细胞壁组分精准解离机制，提出木材细胞壁S2和S3（S2~S3）层微区定向原位纤丝化及其网络结构构筑方法，解析木材细胞壁组分、纤丝化网络与孔隙结构的互作响应关系。通过选择性氧化、表面接枝、化学聚合等手段修饰木材细胞壁纤丝化网络表面性能，揭示木材细胞壁纤丝化网络表面定向修饰机制。探明功能组分在木材中的动态传质过程，从分子水平阐明木材细胞壁纤丝化网络界面调控及其重组机制，为木材改性、功能重组与提质增效利用提供理论基础与科学依据。

Targeted composition dissociation and directional structural control of wood cell wall are the foundation stones of wood modification, functional recombination and development of advanced wood composites material. A well targeted composition dissociation and a fine directional structural control are of great significance for improving wood quality and enhancing utilization. Aiming at the basic scientific issues such as lacking of explicit illustration of targeted components dissociation mechanism of wood cell wall and directional control methods of cell wall micro-nano structure, this project intendedly employs chemical depolymerization, surface charge regulation and other methods to systematically study the targeted cell wall composition dissociation mechanism of soft wood and hard wood such as Chinese fir and Poplar, proposes methods of directional in-situ fibrillation of S2 and S3 layers of wood cell wall and construction of fibrillated network structure, ascertains the interactive response relationship among wood cell wall components, fibrillation network and pore structure. By adopting various methods such as selective oxidation, surface grafting, chemical polymerization to modify the surface properties of fibrillated network, reveals the directional modification mechanism of the fibrillated network surface of wood cell wall. This project also analyzes dynamic mass transfer process of functional components in wood, and clarifies the interface regulation mechanism of cell wall fibrillation network from the molecular level, which further provide scientific theoretical basis for wood modification, functional reorganization, maximum utilization with quality and efficiency improvement.