苎麻纤维可用于制备比玻纤增强体系更轻性能更好的环氧树脂复合材料。但是，由于麻纤维自身易燃而使得其复合材料比玻纤体系更难阻燃，常采用对麻纤维进行表面化学处理和/或阻燃环氧树脂实现复合材料的阻燃，从而使阻燃过程复杂化。为了有效解决上述问题，本项目提出在不外加其它阻燃剂而仅仅采用具有金属离子阻燃作用的海藻酸纤维与苎麻纤维混纺通过前者的界面催化阻燃实现环氧树脂复合材料阻燃的新方法。为了获得阻燃效率高和综合性能好的复合材料，研究探索出适用于阻燃环氧树脂的不同金属离子的海藻酸盐及其制备的海藻酸纤维，明晰海藻酸纤维中金属离子的种类、含量对环氧树脂阻燃性能及燃烧行为的作用机制，揭示其界面催化阻燃及抑烟机理；研究不同配比的苎麻/海藻酸纤维增强的环氧树脂复合材料的界面性质与其阻燃和力学性能，阐明其界面行为与各种性能的关系，为制备高性能阻燃生物质纤维增强树脂基复合材料提供新方法和科学依据，具有学术和应用价值。

The focus on bio-based fiber-reinforced polymer composites is rapidly growing both in terms of their industrial applications and fundamental research. And the bio-based fiber-reinforced polymer composites are more environmentally friendly, and can be used in railway coaches, automobiles, aerospace, military applications, building, ceiling paneling, partition boards, and so on. Therefore, the flammability characteristics of the composites based on polymers and bio-based fibers play an important role. Flammability and toxic fumes produced during the combustion process are two of the very important parameters, limiting the application of a bio-based fiber-reinforced composite to a given area. As one of bio-based fibers, alginate fibers are a kind of the inherently flame-retardant materials. In this project, the alginate fibers will be proposed to solve the flammability and toxic fumes produced during the combustion process of bio-based fiber-reinforced epoxy resin composites by the interfacially catalytic flame retardancy. Firstly, the flame-retardant epoxy resin is prepared with different alginates as flame retardants. The effects of metal ions on the thermal stability, flame retardancy and mechnical properties of epoxy resin will be investigated. On the basis of the results, the alginates suitable for flame-retardant epoxy resin will be selected and the corresponding alginate fibers will be prepared. Secondly, the thermal stability, mechanical properties, flame retardancy and combustion behaviors of alginate fibers/epoxy resin composites will be explored. The difference of metal ions in alginate fibers on the interfacially catalytic flame retardancy and smoke suppression of epoxy resin will be revealed. And the interfacially catalytic flame-retardant mechanism and smoke suppression mechanism of alginate fibers/epoxy resin composites will be clarified. Thirdly, ramie/alginate fibers reinforced epoxy resin composites will be prepared. The interfacial behavior, microstructure and comprehensive properties of the composites will be studied, and the relationship between interfacial behaviors and properties will be demonstrated. Finally, the bio-based fiber-reinforced epoxy resin composites with higher fire safety and excellent mechanical properties will be successfully prepared. Therefore, this project has both scientific meanings and application prospects and hence to provide a scientific basis for the design and preparation of high-efficiency flame-retardant bio-based fiber-reinforced polymer composites, and improves the academic and technical level of high-efficiency, environmental protection and flame-retardant polymer materials. And this project may raise a new thought to develop a new kind of flame-retardant polymer materials.