Facile preparation of conductive silicone rubber composite foams with tunable cell morphologies and absorption-dominant characteristics

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-07-07 DOI:10.1016/j.supflu.2024.106346

Tianping Zhang , Menglong Xu , Weijun Zhen , Ling Zhao

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Abstract

Flexible silicone rubber (SR) foams with tunable cellular morphologies were fabricated via supercritical CO₂ 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 (SSE) and absorption coefficient (A), 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 SSE, demonstrating a considerable electromagnetic interference shielding effectiveness (EMI SE). 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.

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轻松制备具有可调细胞形态和吸收主导特性的导电硅橡胶复合泡沫

通过超临界二氧化碳发泡制造了具有可调蜂窝形态的柔性硅橡胶（SR）泡沫。优先选择了成本低、复合粘度高的改性导电炭黑（CB）。研究人员仔细研究了孔径和空隙率对 SR/CB 复合泡沫的导电性和介电常数的影响。泡沫的孔径会影响特定屏蔽效能（SSE）和吸收系数（A），而空隙率的变化不会产生明显的变化。与固体泡沫相比，孔径为 59.9 μm 的泡沫密度降低了 50%，吸收率提高了 31.6%，SSE 提高了 95.7%，显示出相当高的电磁干扰屏蔽效能（EMI SE）。泡沫孔径和空隙率的减少提高了压缩模量和强度。此外，还简化了样品制备过程，使工业生产更加容易。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.