Effects of silver nanowires and their surface modification on electromagnetic interference, transport and mechanical properties of an aerospace grade epoxy

IF 2.3 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES
Merve Özkutlu Demirel, Mahide B Öztürkmen, Müzeyyen Savaş, Evren Mutlugün, Talha Erdem, Yahya Öz
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Abstract

The aerospace industry has progressively grown its use of composites. Electrically conductive nanocomposites are among important modern materials for this sector. We report on a bulk composite containing silver nanowires (AgNW) and an aerospace grade epoxy for use in carbon fiber reinforced polymers (CFRPs). AgNWs’ surfaces were also modified to enhance their ability to be dispersed in epoxy. Composites were obtained by use of three-roll milling which is of major interest for industrial applications, especially for the aerospace sector, since the process is scalable and works for aerospace grade resins with high curing temperatures. Our main objective is to improve the electromagnetic interference (EMI) shielding performance of CFRPs via improving the properties of the resin material. The addition of AgNWs did not considerably alter the flexural strength of the epoxy, however the composite with surface-modified AgNWs has a 46 % higher flexural strength. Adding AgNWs over a low threshold concentration of 0.05 wt% significantly enhanced the electrical conductivity. Conductivities above the percolation threshold lie around 102 S/m. At a concentration of 5 wt% AgNW, the EMI shielding efficiency (SE) of epoxy increased from 3.49 to 12.31 dB. Moreover, the thermal stability of the epoxy was unaffected by AgNWs. As a result, it was discovered that (surface modified) AgNWs improved the (multifunctional) capabilities of the aerospace grade epoxy resin which might be used in CFRPs to further enhance properties of composites parts, demonstrating suitability of AgNWs’ as a reinforcement material in aerospace applications.
银纳米线及其表面改性对航空航天级环氧树脂的电磁干扰、传输和机械性能的影响
航空航天业已逐步增加对复合材料的使用。导电纳米复合材料是该领域重要的现代材料之一。我们报告了一种含有银纳米线(AgNW)和航空航天级环氧树脂的大块复合材料,可用于碳纤维增强聚合物(CFRP)。我们还对银纳米线的表面进行了改性,以增强其在环氧树脂中的分散能力。复合材料是通过三辊研磨获得的,这对于工业应用,尤其是航空航天领域具有重大意义,因为该工艺具有可扩展性,适用于固化温度较高的航空航天级树脂。我们的主要目标是通过改善树脂材料的性能来提高 CFRP 的电磁干扰(EMI)屏蔽性能。添加 AgNWs 并未显著改变环氧树脂的抗弯强度,但添加了表面改性 AgNWs 的复合材料的抗弯强度提高了 46%。在 0.05 wt% 的低阈值浓度范围内添加 AgNWs 可显著提高导电性。高于渗流阈值的电导率约为 102 S/m。当 AgNW 的浓度为 5 wt% 时,环氧树脂的 EMI 屏蔽效率 (SE) 从 3.49 dB 提高到 12.31 dB。此外,环氧树脂的热稳定性不受 AgNWs 的影响。因此,研究发现(表面改性)AgNWs 提高了航空航天级环氧树脂的(多功能)性能,可用于 CFRP,进一步提高复合材料部件的性能,这表明 AgNWs 适合用作航空航天应用中的增强材料。
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来源期刊
Journal of Composite Materials
Journal of Composite Materials 工程技术-材料科学:复合
CiteScore
5.40
自引率
6.90%
发文量
274
审稿时长
6.8 months
期刊介绍: Consistently ranked in the top 10 of the Thomson Scientific JCR, the Journal of Composite Materials publishes peer reviewed, original research papers from internationally renowned composite materials specialists from industry, universities and research organizations, featuring new advances in materials, processing, design, analysis, testing, performance and applications. This journal is a member of the Committee on Publication Ethics (COPE).
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