Flexible silicone rubber (SR) foams with tunable cellular morphologies were fabricated supercritical CO foaming. Conductive carbon black (CB) modified at a low cost and with high complex viscosity was preferentially selected. The effects of the pore size and void fraction on the electrical conductivity and dielectric permittivity of the SR/CB composite foams were carefully investigated. The pore size of the foams affected the specific shielding effectiveness () and absorption coefficient (), whereas the variation in the void fraction did not generate evident changes. In comparison with its solid counterpart, a foam with a pore diameter of 59.9 μm showed a 50 % decrease in density, 31.6 % increase in absorptivity, and 95.7 % increase in , demonstrating a considerable electromagnetic interference shielding effectiveness (EMI ). Decreases in the pore size and void fraction of the foams improved compression modulus and strength. In addition, sample preparation process was simplified, making industrial production easier.

中文翻译：

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轻松制备具有可调泡孔形态和吸收主导特性的导电硅橡胶复合泡沫


采用超临界 CO 发泡技术制备了具有可调泡孔形态的柔性硅橡胶 (SR) 泡沫。优先选择低成本、高复数粘度的改性导电炭黑（CB）。仔细研究了孔径和空隙率对 SR/CB 复合泡沫的电导率和介电常数的影响。泡沫的孔径影响特定的屏蔽效能（）和吸收系数（），而空隙率的变化并没有产生明显的变化。与固体泡沫相比，孔径为59.9μm的泡沫密度降低了50％，吸收率提高了31.6％，并且增加了95.7％，表现出相当大的电磁干扰屏蔽效能（EMI）。泡沫孔径和空隙率的减小提高了压缩模量和强度。此外，简化了样品制备过程，使工业生产变得更加容易。