热固性树脂的增韧增强是研究的热点和难点问题。本项目从增韧增强基本原理及存在问题出发，利用“牺牲键”的低键能和动态可逆特性，通过在苯并噁嗪/热固性树脂体系中添加负载过渡金属化合物的介孔SiO2，一步引入“牺牲键”、密度梯度变化层、无机-有机“互穿网络”、反应诱导相分离等多尺度结构，实现多尺度结构协同增韧增强和复合材料冲击后压缩（CAI）性能大幅提升的目的。从理论上研究不同结构介孔材料负载不同过渡金属化合物的负载工艺、负载量、负载效率；研究介孔材料负载过渡金属化合物对苯并噁嗪/热固性树脂反应诱导相分离的影响，建立相分离模型；研究不同结构的形成过程及形貌，建立固化参数与固化物结构之间的相互联系；研究不同结构对固化物热性能、力学性能和CAI性能的影响，建立结构与性能之间的相互关系，揭示不同结构增韧增强机理及多尺度结构协效作用机制。为热固性树脂增韧增强改性开辟出新途径，并进一步丰富和夯实其理论基础。

Toughening and strengthening of thermoset resin is a hot and difficult topic. Based on basic mechanism of toughening and strengthening and related problems, mesoporous SiO2 loaded with transition metal compounds blended with benzoxazine/thermoset resins in this program. In this system, “sacrificial bond”, the gradient variation of the density, inorganic-organic “interpenetrating network” and reaction induced phase separation structures were formed in one step. When facing the impact, “sacrificial bond” broke first and then other structures broke and meanwhile the corresponding compression after impact (CAI) property of fiber reinforced matrix composites were improved because of the multi-scale structures and the characteristic of low bond energy and dynamic reversibility of “sacrificial bond”. Research on the theory of loading method, loading capacity and loading efficiency of different structures of mesoporous materials. Study on the influences of mesoposrous materials loaded with transition metal compounds on reaction induced phase separation of benzoxazine/thermoset resin. Focus on forming process and morphology of different structures, especially, build up the relationship between curing parameter and curing structure and realize the effective controlling to the structure of the interface. Study the influences of different structures on thermal, mechanical of thermoset resins and CAI property of composites and establish the relationship between structures and properties and illustrate the mechanism and synergistic effect of multi-scale structures on toughening and strengthening. This program will provide a new way for toughening and strengthening of thermoset resin and rich and tamp related theory foundation.