Home-synthesized carbon aerogels were used as reinforcements for epoxy nanocomposites in different weight contents (0.1, 0.3, and 0.5 wt%). The relationship between physical structure of aerogels (specific surface area and total pore volume) and mechanical properties of nanocomposites were evaluated. The fracture toughness of nanocomposites was investigated by both direct and indirect methods. The nanocomposites provided better mechanical properties than neat epoxy. Due to the penetration of polymer chains into the aerogels’ pores, the filler/polymer interface was increased, which lead to an effective increase in load transfer. The porous structure of the aerogels absorbs energy and external force applied, which ultimately plays a role in properties improvement. Due to the higher specific surface area of CNT-doped carbon aerogels (CNT-CA), Ep/CNT-CA nanocomposites showed a better performance. Improvement of fracture toughness in 3-point bending test was greater than impact test. Mechanical and topographical investigations of nanocomposites showed enhancements: 106–143% K_IC, 241–372% G_IC, 50–58% impact strength and 10.28–14.72 nm roughness, compared to the epoxy matrix.

家庭合成的碳气凝胶被用作不同重量含量（0.1、0.3 和 0.5 wt%）的环氧纳米复合材料的增强材料。评估了气凝胶的物理结构（比表面积和总孔体积）与纳米复合材料的机械性能之间的关系。通过直接和间接方法研究了纳米复合材料的断裂韧性。纳米复合材料提供比纯环氧树脂更好的机械性能。由于聚合物链渗透到气凝胶的孔隙中，填料/聚合物界面增加，从而有效增加了负载转移。气凝胶的多孔结构吸收能量和施加的外力，最终起到改善性能的作用。由于 CNT 掺杂的碳气凝胶 (CNT-CA) 具有更高的比表面积，Ep/CNT-CA 纳米复合材料表现出更好的性能。三点弯曲试验中断裂韧性的提高大于冲击试验。纳米复合材料的机械和地形研究显示增强：106-143% K_IC，241–372% G _IC，50–58% 冲击强度和 10.28–14.72 nm 粗糙度，与环氧树脂基质相比。