中文摘要：

以超临界二氧化碳为物理发泡剂,制备出一种具有良好导电性能的硅橡胶/碳纳米管/炭黑多相复合泡沫材料。系统研究了不同碳纳米管含量及不同加工参数对硅橡胶发泡行为和最终硅橡胶泡沫材料导电性能的影响。实验结果表明,碳纳米管和炭黑在硅橡胶基体中分散良好,无明显团聚体出现。均匀分散的碳纳米管能够提高发泡时的成核密度,从而得到具有较小泡孔尺寸和较高泡孔密度的泡沫材料。研究发现随着饱和温度升高,泡孔尺寸变大,泡孔合并现象明显;随饱和压力增加,泡孔尺寸变小,泡孔密度增加,泡孔合并现象减少。不同泡孔形态对应其导电性能也有所不同,当泡孔尺寸较小,泡孔分布均匀的泡沫材料导电性能较好。

英文摘要：

A novel silicone rubber/carbon nanotuhe/carbon hlack composite foam was prepared by using supercritieal carbon dioxide as the physical foaming agent. The effects of different carbon nanotubes and the different processing parameters on the foaming behavior of silicone rubber and the electrical properties of silicone rubber foams were systematically studied. The results show that carbon nanotubes and carbon black were well dispersed in the silicone matrix and there were no obvious aggregates around the matrix. The well dispersed conductive fillers could increase the cell nucleation density when foaming. Thus, the foam has quite small cell size and high cell density. Moreover, it was found that the cell size became larger and more cell collapse was observed with the increase of the saturated temperatures. While, the foam with small cell size and high cell density could be obtained by increasing the saturated pressures. Furthermore, the foam with small cell size, high cell density and uniform cells corresponded to the better conductive performance.