A cast-in-place process is usually adopted to prepare bicontinuous composites which display good mechanical properties and excellent comprehensive performance. But the construction of an intercommunicating porous skeleton seems to be cumbersome and low efficient. Here we report a three-dimensional nanofibers foam (3D NFF), which has been fabricated and applied to enhance epoxy resin composite. The 3D NFF skeletons with densities from 0.028 to 0.218 g/cm³ were fabricated by regulating the conditions for the nanofiber growth. The 3D NFFs were conveniently modified with a silane coupling agent to improve the interface interaction with the epoxy matrix. Compared to the pure epoxy, the compressive strength of the cast-in-place processed 3D NFFs/epoxy composite was improved by 436.8% at loading of 3.9 wt%, and the flexural strength was increased by 133.5% at loading of 5.3 wt%. While the compressive and flexural strength of the NFPs/epoxy composite prepared through traditional mixing method was increased by 173.6% at loading of 3.9 wt%, and 63.1% at loading of 5.3 wt%, respectively.

通常采用现浇法制备具有良好机械性能和优异综合性能的双连续复合材料。但是，相互连通的多孔骨架的构造似乎麻烦且效率低下。在这里，我们报告了三维纳米纤维泡沫（3D NFF），该泡沫已被制造并用于增强环氧树脂复合材料。密度为0.028至0.218 g / cm ³的3D NFF骨架通过调节纳米纤维的生长条件来制备它们。使用硅烷偶联剂方便地修饰3D NFF，以改善与环氧基质的界面相互作用。与纯环氧树脂相比，现场浇铸处理的3D NFF /环氧树脂复合材料在3.9 wt％的载荷下的抗压强度提高了436.8％，在5.3 wt％的载荷下抗弯强度提高了133.5％。通过传统的混合方法制备的NFP /环氧树脂复合材料的抗压强度和抗弯强度分别在3.9重量％和5.3重量％时分别增加了173.6％和63.1％。