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首页> 外文期刊>Applied Surface Science >Constructing multiple interfaces in polydimethylsiloxane/multi-walled carbon nanotubes nanocomposites by the incorporation of cotton fibers for high-performance electromagnetic interference shielding and mechanical enhancement
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Constructing multiple interfaces in polydimethylsiloxane/multi-walled carbon nanotubes nanocomposites by the incorporation of cotton fibers for high-performance electromagnetic interference shielding and mechanical enhancement

机译：通过掺入棉纤维在聚二甲基硅氧烷/多壁碳纳米管纳米复合材料中构建多个界面，以实现高性能的电磁干扰屏蔽和机械增强

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摘要

Reflection of electromagnetic waves at multiple interfaces and then absorption in the matrices has been well demonstrated to efficiently improve electromagnetic interference (EMI) shielding of conducive polymer composites (CPC). In this study, a large number of multiple interfaces were constructed in polydimethylsiloxane/mull-walled carbon nanotubes (PDMS/MWCNT) nanocomposites by the incorporation of cotton fibers (CTF). The electromagnetic radiation was efficiently attenuated by the wave reflection at the multiple interfaces and then absorption at the interfaces of PDMS/CTF and CTF/MWCNT in the nanocomposites. The EMI shielding effectiveness (SE) of the PDMS/MWCNT nanocomposites with 2.0 and 3.0 vol% MWCNT increased from similar to 16 to similar to 30 dB, similar to 20 to similar to 41 dB by adding 15 vol% CTF, respectively. A relatively dense MWCNT network, which was also formed in the PDMS/MWCNT/CTF nanocomposites because of the volume occupation effect of CTF, resulted in the high electrical conductivity and low percolation threshold. For example, the electrical conductivity of the PDMS/MWCNT nanocomposites with 0.5 vol% MWCNT increased from 1.65 x 10(-4) to 0.23 S/m, and the percolation threshold of the composites deceased from 0.44 to 0.2 vol% by the addition of 15 vol% CTF. In addition, the mechanical properties, especially the Young's modulus and tensile strength, of PDMS/MWCNT nanocomposites were enhanced by the incorporation of CTF and the flexible property was maintained because of the high interfacial interaction between PDMS and CTF and the high aspect ratio of CTF. Furthermore, the samples exhibited highly reliable EMI SE even after bending 6000 times, suggesting the potential application in body protection and flexible electronic devices.
机译：电磁波在多个界面处的反射然后在基体中的吸收已得到充分证明，可以有效地改善导电聚合物复合材料（CPC）的电磁干扰（EMI）屏蔽。在这项研究中，通过掺入棉纤维（CTF），在聚二甲基硅氧烷/全壁碳纳米管（PDMS / MWCNT）纳米复合材料中构建了大量的多个界面。在纳米复合材料中，电磁辐射被多个界面处的波反射有效衰减，然后在PDMS / CTF和CTF / MWCNT的界面处吸收。 MWCNT分别为2.0和3.0的PDMS / MWCNT纳米复合材料的EMI屏蔽效能（SE）通过分别添加15 vol％的CTF从相似的16倍增加到相似的30 dB，相似的20相似到41 dB。由于CTF的体积占据效应，PDMS / MWCNT / CTF纳米复合材料中也形成了相对致密的MWCNT网络，从而导致了高电导率和低渗透阈值。例如，MWMS为0.5％（体积）的PDMS / MWCNT纳米复合材料的电导率从1.65 x 10（-4）增加到0.23 S / m，复合材料的渗透阈值通过添加5％从0.44％降至0.2％（体积）。 15体积％的CTF。此外，通过加入CTF增强了PDMS / MWCNT纳米复合材料的机械性能，尤其是杨氏模量和拉伸强度，并且由于PDMS与CTF之间的界面相互作用高以及CTF的长宽比高，从而保持了挠性。 。此外，即使弯曲6000次后，样品仍显示出高度可靠的EMI SE，表明其在人体保护和柔性电子设备中的潜在应用。

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