Rheological properties, determined by cross-linked structure of silicone rubber and plasticization of CO₂, would affect the cell nucleation and the cell growth during supercritical CO₂ (scCO₂) foaming. In this study, the effects of the crosslinking density and CO₂ saturation condition on rheological properties have been comprehensively analyzed. The silicone rubber foams with different cellular structures were designed by adjusting scCO₂ foaming conditions. The results show that the suitable crosslinking density (1.47 × 10⁻⁴ mol cm^-3) would be beneficial to prepare silicone rubber foams with high porosity (80.6 %). The foaming behavior of silicone rubber would be greatly affected by the saturation temperature and the saturation pressure, resulting in several orders of magnitude changes in cell density, but the saturation time has little influence. This research helps to reveal the connection between rheological property and foaming behavior, and provide an eco-friendly way to design the cellular structure by adjusting the rheological property of silicone rubber.

由硅橡胶的交联结构和CO _2的增塑确定的流变性质将影响超临界CO ₂（scCO ₂）发泡过程中的细胞成核和细胞生长。在这项研究中，已全面分析了交联密度和CO ₂饱和条件对流变性能的影响。通过调节scCO ₂发泡条件设计了具有不同泡孔结构的硅橡胶泡沫。结果表明，合适的交联密度（1.47×10 ^-4 mol cm ^-3）将有利于制备高孔隙率（80.6％）的硅橡胶泡沫。饱和温度和饱和压力会极大地影响硅橡胶的发泡行为，导致泡孔密度变化几个数量级，但饱和时间的影响很小。这项研究有助于揭示流变性和发泡行为之间的联系，并提供一种通过调整硅橡胶的流变性来设计孔结构的环保方法。