Enhanced microwave shielding and mechanical properties of high loading MWCNT-epoxy composites
Enhanced microwave shielding and mechanical properties of high loading MWCNT-epoxy composites
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DOI：
10.1007/s11051-013-1554-0
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发表时间：
2013-04-01
影响因子：
2.5
通讯作者：
Mathur, R. B.
中科院分区：
文献类型：
--
作者：
Singh, B. P.;Prasanta;Mathur, R. B.
对于开发高效、薄的电磁干扰（EMI）屏蔽材料而言，高负载量碳纳米管（CNT）在环氧树脂中的分散是一项具有挑战性的任务。第一步，通过在环氧树脂中形成 CNT 预浸料，复合材料中的多壁碳纳米管 (MWCNT) 负载量高达 20 wt%。然后将这些预浸料层压板压塑形成复合材料，在 X 频段 (8.2-12.4 GHz) 下，0.35 毫米厚的薄膜的 EMI 屏蔽效能为 -19 dB，1.75 毫米厚的复合材料的 EMI 屏蔽效能为 -60 dB。如此高屏蔽的原因之一是这些复合材料实现了约 9 S cm(-1) 的高电导率，这比之前报道的该负载下的结果至少高一个数量级。此外，观察到拉伸强度比纯树脂值提高了 40%。 MWCNT-环氧树脂复合材料的热导率达到 2.18 W/mK，而固化环氧树脂的热导率仅为 0.14 W/mK。
Dispersion of high loading of carbon nanotubes (CNTs) in epoxy resin is a challenging task for the development of efficient and thin electromagnetic interference (EMI) shielding materials. Up to 20 wt% of multiwalled carbon nanotubes (MWCNTs) loading in the composite was achieved by forming CNT prepreg in the epoxy resin as a first step. These prepreg laminates were then compression molded to form composites which resulted in EMI shielding effectiveness of -19 dB for 0.35 mm thick film and -60 dB at for 1.75 mm thick composites in the X-band (8.2-12.4 GHz). One of the reasons for such high shielding is attributed to the high electrical conductivity of the order of 9 S cm(-1) achieved in these composites which is at least an order of magnitude higher than previously reported results at this loading. In addition, an improvement of 40 % in the tensile strength over the neat resin value is observed. Thermal conductivity of the MWCNTs-epoxy composite reached 2.18 W/mK as compared to only 0.14 W/mK for cured epoxy.