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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Carbon Nanotube Dispersion on the Complex Permittivity and Absorption of Nanocomposites in 2-18 GHz Ranges
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Effect of Carbon Nanotube Dispersion on the Complex Permittivity and Absorption of Nanocomposites in 2-18 GHz Ranges

机译：碳纳米管分散对2-18 GHz范围内纳米复合材料的介电常数和吸收的影响

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摘要

The effect of dispersion processes on complex permittivity (ε'-ε") and microwave absorption in 2218 GHz ranges is presented for nanocomposites loaded with different amounts of carbon nanotubes (CNTs) ranging from 1 to 5 wt %. The ultrasonic sonication (US) method and the three-roll mill (TRM) method were performed for the manufacturing of the CNT/epoxy absorbers with different dispersing levels. Microscopic observations revealed that the CNT agglomerates were reduced after the TRM process, and individual CNTs were uniformly dispersed in the epoxy resin. For the same weight content of CNT fillers, the percentage increase of ε' between US and TRM samples varies from 35.5% to 101.7% while the corresponding increment of ε" (dielectric loss) varies from 79.6% to 248.8%. A minimum reflection loss for the US sample with 2 wt % CNTs is only -7.8 dB at 11.3 GHz while the corresponding TRM sample is greatly improved to reach -37.4 dB at 7.76 GHz for the same matching thickness of 3 mm. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40963.
机译：对于负载了1至5 wt％的不同数量的碳纳米管（CNT）的纳米复合材料，提出了分散过程对2218 GHz范围内的复介电常数（ε'-ε“）和微波吸收的影响。分别采用三辊磨法和三辊磨法制备分散度不同的碳纳米管/环氧吸收剂，显微镜观察发现碳纳米管在TRM工艺后的团聚体减少，单个碳纳米管均匀分散在环氧树脂中。对于相同重量的CNT填料，US和TRM样品之间ε'的百分比增加从35.5％到101.7％，而ε“（介电损耗）的相应增加从79.6％到248.8％。对于具有2 wt％CNT的美国样品，在11.3 GHz处的最小反射损耗仅为-7.8 dB，而在3mm的相同匹配厚度下，相应的TRM样品在7.76 GHz处得到了极大改善，达到-37.4 dB。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，40963。

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