纤维素纳米晶/类玻璃高分子复合材料的设计制备及性能研究

类玻璃高分子是一种含动态共价键的交联网络，通过热激活的缔合键交换反应来改变其交联网络的拓扑结构，兼具了热塑性和热固性塑料的优点。在类玻璃高分子中引入填料粒子是提高材料强度、甚至产生新功能的有效策略，然而调节类玻璃高分子复合材料性能的设计规则仍处于探索阶段。纤维素纳米晶（CNC）是一种来自竹子等植物的绿色资源，具有很高的强度、质轻、透明及优异的生物相容性，与其它纳米增强材料相比，它来源广泛、可再生且价格低廉。本项目拟通过不同的类玻璃高分子基体来制备具有高性能的CNC/类玻璃高分子复合材料，研究CNC对类玻璃高分子复合材料力学性能，如拉伸强度及模量、断裂伸长率的影响，对复合材料流变行为及可塑性能的调节机制。本项目有望为高性能CNC/类玻璃高分子复合材料的制备提供理论指导和技术支持，具有重要的科学意义。

Vitrimers are dynamic covalent polymer networks, which adapt their shape through thermally activated associative bond-exchange reactions，combining the advantages of thermoplastics and thermosets. The introduction of filler materials in vitrimers is a versatile strategy to enhance a material’s strength and even engender new functionality. Unfortunately, the design rules governing the properties of vitrimer composites are yet unexplored. Cellulose nanocrystalline (CNC) is a kind of green resource from bamboo and other plants, which exhibits high strength, lightweight, transparency and excellent biocompatibility. Compared with other nanomaterials, it is renewable and less expensive to produce and a wide range of resources. In this project, based on different vitrimers matrix, we will develop high-performance CNC/vitrimer composites. Then the influence of CNC on the mechanic properties of those composites such as tensile strength, modulus, and elongation will be studied, as well as the mechanism regulating the rheological behavior and reprocessability of the composites will be studied. It is anticipated to provide theoretical guidance and technical support for the preparation of high-performance CNC/vitrimer composites, which is of great scientific significance.