Graphene oxide/carbon nanotube aerogel (GOCA) with honeycomb three-dimensional framework is an ideal reinforcement material which can significantly improve the dispersion in the polymer matrix, and enhance the mechanical properties, thermal and electrical conductivity of the composites. In this work, large-size GOCA and GOCA/polystyrene (GOCA/PS) composite sheet were prepared via critical drying and in-situ polymerization, respectively, and the standard splines of mechanical properties were tested. The results indicated that the tensile, flexural, compressive, and impact strengths of GOCA/PS composites increased with the increase of GOCA content. When the GOCA content was 1.1 wt %, the above mechanical properties increased to the maximum, increased by 103.29%, 60.30%, 177.03%, and 611.38%, respectively. However, as the content of GOCA increased, the electrical conductivity and thermal conductivity showed an increasing trend. In addition, the synergistic enhancement mechanism between GO and CNTs has also been studied. We believe that the present method may provide an effective route for the design and investigation of reinforced composites.

具有蜂窝三维骨架的氧化石墨烯/碳纳米管气凝胶（GOCA）是一种理想的增强材料，可以显着改善在聚合物基体中的分散性，提高复合材料的机械性能、导热性和导电性。在这项工作中，分别通过临界干燥和原位聚合制备了大尺寸 GOCA 和 GOCA/聚苯乙烯 (GOCA/PS) 复合片材，并测试了机械性能的标准样条。结果表明，GOCA/PS复合材料的拉伸、弯曲、压缩和冲击强度随着GOCA含量的增加而增加。当GOCA含量为1.1 wt%时，上述力学性能提高到最大值，分别提高了103.29%、60.30%、177.03%和611.38%。然而，随着 GOCA 含量的增加，电导率和热导率呈上升趋势。此外，还研究了GO和CNT之间的协同增强机制。我们相信，本方法可为增强复合材料的设计和研究提供有效途径。