Nisin交联纳米纤维素微凝胶及其强化Pickering泡沫结构与性能研究

生物质基泡沫包装材料是现代包装发展的必然趋势。在纳米纤维素的基础上构建高性能复合多孔材料，探索一种形态密度及性能可调控的纳米纤维素泡沫的制备方法，对于拓宽纤维素泡沫材料的应用具有重要意义。本项目针对纳米纤维素复合泡沫材料开发中孔隙结构和力学性能不可控这一关键问题，拟利用Pickering乳液技术对纳米纤维素进行界面组装，调控纳米纤维素复合泡沫材料的结构和性能。本项目利用天然生物活性抗菌肽Nisin交联制备纳米纤维素微凝胶，调控微凝胶在AESO-水相界面的分布和成膜性能，制备高稳定的AESO乳液，并借助Pickering乳液在泡沫结构设计上的显著优势，将纳米纤维素和AESO两个独立体系的优点充分结合起来，协同利用纳米纤维素微凝胶的界面稳定性能和力学增强性能，实现泡沫孔隙结构和力学性能精确可控，探索Pickering泡沫的成型过程和作用机制，为高性能纳米纤维素基泡沫材料的开发提供理论和技术支持。

Development of biomass-based foam packaging material is the trend of modern packaging. The construction of high-performance composite porous materials with adjustable morphology density and properties from nano-cellulose in a novel way is of great significance for expanding the application of cellulose foam materials. With the aim to solve the key problem of uncontrollable pore structure and mechanical properties in the development of nanocellulose composite foam materials, this project plans to use Pickering emulsion technology to conduct interface assembly of nanocellulose, and regulate the structure and properties of nanocellulose composite foam materials. Nanocellulose microgels is proposed to be prepared by natural antimicrobial peptide Nisin induced gelation, and a highly stable AESO emulsion is to obtain by regulating the distribution and film-forming properties of the microgels at the AESO-water interface. By introducing the Pickering emulsion in the foam structure design, this project provides a way to combine the advantages of the nanocellulose and AESO two independent system, and achieve a collaborative use of interface stability and mechanics performance of nanocellulose microgels. The forming process and mechanism of Pickering foam are to be thoroughly investigated to achieve the goal of controllable regulating pore structure and mechanical properties of the foam. The project will provide theoretical fundamentals and technical support for the development of high-performance nanocellulose based foam materials.