生物降解纳米复合食品包装材料是国际食品与生物化工领域未来发展的新型包装材料。由于借助纳米粒子能够改变材料的微结构而明显提高该材料对水蒸气、氧气等小分子的阻隔性能，因此，必须深入探讨这类新型材料中纳米粒子与高分子结构特征、纳米粒子与高分子链段等的相互作用对其微结构的影响以及对小分子传质过程的作用规律，为这类新型包装材料的理性设计提供理论依据。本项目选择淀粉基生物降解材料为研究对象，通过调控纳米粒子分散在淀粉超分子体系的微观结构，构建不同聚集态结构的淀粉基纳米复合食品包装材料，探讨纳米粒子结构、淀粉大分子结构等对所构建的新型包装材料聚集态结构和/或高分子链结构的影响，系统研究水蒸气、氧气等典型小分子在这些不同微结构的新型材料中质量传递规律，借助超分子理论、自由体积理论和分子动力学等，从分子、介观及宏观等多尺度解析这些小分子在这类新型包装材料中的传递及其控制机制，建立可以指导理性设计的相关模型。

Biodegradable nanocomposite for food packaging is a novel packaging material and stands for the development in the area of international food and biochemical engineering. Nanoparticles could effectively change the microstructure of the material and thus enhance the barrier properties, preventing the small molecules, such as water vapor and oxygen etc., from diffuse through the film matrix. Therefore, the effects should be thoroughly studied of nanoparticles, polymer structures and the interaction between nanoparticles and polymer chain segments on the microstructure of the film material and on the mass transfer of the small molecules, which could provide the theoretical basis for the design for this novel material. The biodegradable starch-based nanocomposites material will be focused on in this project with different aggregation structures via adujusting the microstructure of starch supramolecular system with dispersed nanoparticles. The influences of nanoparticles and starch structures on the aggregation structure and/or polymer chain structure of the packaging materials will be investigated. The mass transfer regulaty describing typical small molecules diffusing within the nanocomposites based on different microstructure will be further elaborated. Finally, based on supramolecular theory, free volume theory and molecular dynamics, the transfer characteristics and control mechanism of these small molecules within this novel packaging material will be analyzed on the molecular, mesoscopic and macroscopic aspects, with the establishment of corresponding models for the purpose of guiding the rational designs for the packaging material.