Multivariate gradient structure design of flexible thermoplastic polyurethane based composite foam for enhanced electromagnetic interference shielding performance

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL Journal of Supercritical Fluids Pub Date : 2024-09-16 DOI:10.1016/j.supflu.2024.106410

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Abstract

Flexible and efficient electromagnetic interference (EMI) shielding polymer composite foams are rapidly developing, but it is difficult to avoid the deterioration of shielding properties after foaming. To solve the issue, in this work, composite foams with multivariate gradient structure of thermoplastic polyurethane (TPU) mixed with multiwalled carbon nanotubes (MWCNTs) were constructed by combining the soft-hard domains proportional gradient of TPU with filler content gradient. Gradient-structured TPU/MWCNTs foams with impedance matching layer and high reflector layer were obtained and impedance matching layer with large cells significantly reduced the density while high reflector layer with a few cells maintained relatively perfect conductive network, whose shielding efficiency was 38.2 % higher than that of unfoamed sample. Furthermore, TPU/MWCNTs composite foams presented great stability even after 1000 times bending. This special multivariate gradient structure shows potential applications in microelectronic devices and aerospace fields and is critical to the development of high-performance EMI shielding polymer foams.

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灵活高效的电磁干扰（EMI）屏蔽聚合物复合泡沫正在迅速发展，但难以避免发泡后屏蔽性能的下降。为解决这一问题，本研究结合热塑性聚氨酯（TPU）的软硬域比例梯度和填料含量梯度，构建了热塑性聚氨酯（TPU）与多壁碳纳米管（MWCNTs）混合的多变量梯度结构复合泡沫。得到了具有阻抗匹配层和高反射层的梯度结构热塑性聚氨酯/多壁碳纳米管泡沫，具有大单元的阻抗匹配层显著降低了密度，而具有少量单元的高反射层则保持了相对完美的导电网络，其屏蔽效率比未发泡样品高出 38.2%。此外，即使弯曲 1000 次，热塑性聚氨酯/MWCNTs 复合泡沫仍具有很高的稳定性。这种特殊的多元梯度结构在微电子器件和航空航天领域具有潜在的应用前景，对于开发高性能 EMI 屏蔽聚合物泡沫至关重要。

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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.