New kind of polymer composites, i.e., co-continuous network polymers (CNP), were fabricated by the filling of the continuous pores of an epoxy monolith (EM) with a cross-linked acrylate polymer. The internal structures of EM and CNP were non-destructively observed by X-ray CT imaging. The mechanical properties of EM were highly dependent on the pore and epoxy frame sizes. Increasing the molar ratio of the amino groups to glycidyl groups during the monolith fabrication process created a coarser co-continuous structure. It greatly enhanced the stretching property of EM. Filling the pores of EM with a rubbery cross-linked acrylate polymer as the second component increased the maximum strength of CNP, independent of the pore size. Furthermore, the gap formation at the boundary between the hard phase and the soft phase of CNP was observed by X-ray CT imaging for the broken test piece used for a tensile test. We discussed a mechanism for the deformation and fracture of EM and CNP.

一种新型聚合物复合材料，即共连续网络聚合物(CNP)，是通过用交联的丙烯酸酯聚合物填充环氧单体(EM) 的连续孔而制成的。通过 X 射线 CT 成像无损观察 EM 和 CNP 的内部结构。EM 的机械性能在很大程度上取决于孔隙和环氧树脂框架尺寸。在整体制造过程中增加氨基与缩水甘油基的摩尔比会产生更粗糙的共连续结构。它大大增强了 EM 的拉伸性能。用橡胶状交联丙烯酸酯聚合物作为第二组分填充 EM 的孔，增加了 CNP 的最大强度，与孔径无关。此外，通过X-ray CT成像对拉伸试验用断裂试片观察CNP硬相和软相边界处的间隙形成情况。我们讨论了 EM 和 CNP 的变形和断裂机制。