随着全球对环境保护的日益重视及我国限塑令的推出和实施，利用可再生植物纤维原料制备高强度超疏水纸或纸板，部分或逐步取代塑料作为包装材料具有重要现实意义。本项目基于层层自组装技术，选用可再生、无毒、来源丰富的天然多糖及其衍生物、无机纳米粒子作为自组装材料，在植物纤维表面构筑纳米级的多层膜对其进行改性，制备具有较好强度性能的超疏水包装用纸。协调增强改性和超疏水改性的不兼容性，构建兼具增强和超疏水改性的层层自组装体系。具体内容包括：采用不同的自组装方案分别在植物纤维表面制备多层膜，首先研究多层膜的表面特性、成膜方式及成膜机制；考察不同的多层膜对成纸强度和表面润湿性能的影响；协调成纸增强改性和超疏水改性不兼容的问题；最后进一步探讨多层膜对成纸的增强和超疏水改性机理。预期研究成果可为层层自组装技术用于植物纤维基包装用纸增强及超疏水改性提供理论依据，为植物纤维原料在绿色包装行业的广泛应用提供基础支撑。

With the growing importance of environmental protection and the implementation of the “plastic limit” policy in China, renewable cellulosic fiber-based packaging materials with high strength and superhydrophobic properties have attracted considerable attention. These fiber-based packaging materials have potential application in partial or whole replacement of plastic packaging materials. In this proposal, some attempts will be made to prepare high strength and superhydrophobic packaging paper through building up nanostructured multilayers composed of natural polysaccharides and their derivatives or inorganic nanoparticles on the cellulosic fiber surface by layer-by-layer (LBL) self-assembly technique. The incompatibilities between strengthening modification and superhydrophobic modification will be coordinated, and the LBL system having strengthening and superhydrophobic modification functions will be constructed. The study content as follows: (i) The LBL multilayers will be constructed on cellulosic fiber surface using different LBL strategies respectively. Surface characters, growth manner and formation mechanisms of multilayers will be studied. (ii) The effect of LBL multilayers built from different LBL system on paper strength and wetting properties will be investigated. (iii) Coordinate the incompatibilities between strengthening modification and superhydrophobic modification. (iv) The strengthening and superhydrophobic modification mechanisms of LBL multilayers will be explored. The study results of this proposal will provide theoretical basis for strengthening and superhydrophobic modification of cellulosic fibers, as well as basis support for cellulosic fibers application in green packaging industry.