Ultralight activated carbon/polyimide foam with heterogeneous interfaces for improved thermal stability, mechanical properties, and microwave absorption

IF 2.7 3区 化学 Q2 POLYMER SCIENCE Journal of Applied Polymer Science Pub Date : 2024-09-14 DOI:10.1002/app.56274
Jiayu Kang, Jingjing Cao, Wei Sun, Xinyu Xu
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Abstract

The activated carbon (AC) has been widely used in the field of electromagnetic protection because of its porous, hollow microstructure and excellent electrical conductivity. In this paper, AC was prepared through KOH activation process. The ACs/polyimide foam (PIF) composite was prepared in situ during the synthesis of PI and the ACs. In this paper, AC was prepared using the potassium hydroxide (KOH) activation process. The AC/PIF composites were prepared by mixing ACs and pyromellitic dianhydride (PMDA) with methylene diphenyl diisocyanate (MDI). The pore structure and surface morphology of the ACs were observed using nitrogen adsorption–desorption isotherms and scanning electron microscopy (SEM). After KOH activation with KOH, the surface area and total pore volume of ACs significantly increased by 79.31% and 0.9539 cm3/g, respectively, mainly were the microporous structure. X-ray photoelectron spectroscopy (XPS) results confirmed an increase in the oxygen content of ACs after KOH activation, indicating an increase in the relative hydroxyl content on the surface. The SEM resulting of the ACs/PIF composite has a well-developed open cell structure. Thermal gravimetric analysis (TGA) revealed that ACs significantly improved the thermal stability of the ACs/PIF composite. The compressive strength of the ACs/PIF-3 increased from 518 to 834 KPa, significantly enhancing its mechanical properties. Simultaneously, the microwave absorption performance can be controlled and regulated by optimizing the impedance gradient of the skeleton. Results showed that when ACs constituted 8 wt% of the PIF, the real permittivity (ɛ′) and imaginary permittivity (ɛ″) of ACs-PIF-5 were approximately 2.03 and 0.025, respectively.

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具有异质界面的超轻活性炭/聚酰亚胺泡沫,可提高热稳定性、机械性能和微波吸收能力
活性炭(AC)因其多孔、中空的微观结构和优异的导电性能而被广泛应用于电磁防护领域。本文采用 KOH 活化工艺制备活性炭。在合成 PI 和 AC 的过程中,原位制备了 AC/聚酰亚胺泡沫 (PIF) 复合材料。本文采用氢氧化钾(KOH)活化工艺制备 AC。AC/PIF 复合材料是通过混合 AC 和甲基二苯基二异氰酸酯(MDI)中的偏苯三酸酐(PMDA)制备而成。利用氮吸附-解吸等温线和扫描电子显微镜(SEM)观察了 AC 的孔隙结构和表面形态。经 KOH 活化后,ACs 的比表面积和总孔体积分别显著增加了 79.31% 和 0.9539 cm3/g,主要表现为微孔结构。X 射线光电子能谱(XPS)结果证实,KOH 活化后 ACs 的氧含量增加,表明其表面羟基相对含量增加。扫描电子显微镜(SEM)结果显示,AC/PIF 复合材料具有发达的开孔结构。热重分析(TGA)显示 ACs 显著提高了 ACs/PIF 复合材料的热稳定性。ACs/PIF-3 的抗压强度从 518 KPa 增加到 834 KPa,大大提高了其机械性能。同时,还可以通过优化骨架的阻抗梯度来控制和调节微波吸收性能。结果表明,当交流电占 PIF 的 8 wt% 时,交流电-PIF-5 的实导率(ɛ′)和虚导率(ɛ″)分别约为 2.03 和 0.025。
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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Editorial Board, Aims & Scope, Table of Contents Synthesis of reaction promoters for epoxy polymerization: Enhancing storage stability and mechanical properties of one-pot epoxy systems
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